CVE-2020-8492

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

The following packages have been upgraded to a later upstream version: python38 (3.8.3). (BZ#1847416)

Security Fix(es):

• PyYAML: command execution through python/object/apply constructor in FullLoader (CVE-2019-20477)

• python: infinite loop in the tarfile module via crafted TAR archive (CVE-2019-20907)

• PyYAML: arbitrary command execution through python/object/new when FullLoader is used (CVE-2020-1747)

• python: wrong backtracking in urllib.request.AbstractBasicAuthHandler allows for a ReDoS (CVE-2020-8492)

• python: DoS via inefficiency in IPv{4,6}Interface classes (CVE-2020-14422)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.3 Release Notes linked from the References section.

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

The following packages have been upgraded to a later upstream version: python38 (3.8.3). (BZ#1847416)

Security Fix(es):

• PyYAML: command execution through python/object/apply constructor in FullLoader (CVE-2019-20477)

• python: infinite loop in the tarfile module via crafted TAR archive (CVE-2019-20907)

• PyYAML: arbitrary command execution through python/object/new when FullLoader is used (CVE-2020-1747)

• python: wrong backtracking in urllib.request.AbstractBasicAuthHandler allows for a ReDoS (CVE-2020-8492)

• python: DoS via inefficiency in IPv{4,6}Interface classes (CVE-2020-14422)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

• Add Oracle Linux distribution in platform.py
• CVE-2018-20852: Prefix dot in domain for proper subdomain validation
• CVE-2020-8492: Python allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client
• CVE-2020-26116: http.client allows CRLF injection if the attacker controls the HTTP request method
• CVE-2020-27619: Unsafe use of eval() on data retrieved via HTTP in the test suite

• Add Oracle Linux distribution in platform.py
• CVE-2018-20852: Prefix dot in domain for proper subdomain validation
• CVE-2020-8492: Python allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client
• CVE-2020-26116: http.client allows CRLF injection if the attacker controls the HTTP request method
• CVE-2020-27619: Unsafe use of eval() on data retrieved via HTTP in the test suite

It was discovered that incorrectly handled certain ZIP files. An attacker could possibly use this issue to cause a denial of service (CVE-2019-9674).

It was discovered that Python documentation had a misleading information. A security issue could be possibly caused by wrong assumptions of this information (CVE-2019-17514).

It was discovered that Python incorrectly handled certain TAR archives. An attacker could possibly use this issue to cause a denial of service (CVE-2019-20907).

It was discovered that Python incorrectly handled certain HTTP requests. An attacker could possibly use this issue to cause a denial of service (CVE-2020-8492).

It was discovered that Python incorrectly handled certain IP values. An attacker could possibly use this issue to cause a denial of service (CVE-2020-14422).

It was discovered that Python incorrectly handled certain character sequences. A remote attacker could possibly use this issue to perform CRLF injection (CVE-2020-26116).

The CVE-2020-14422 issue only affected python3.

This update for python3 fixes the following issues:

Security issues fixed:

• CVE-2019-9674: Improved the documentation to reflect the dangers of zip-bombs (bsc#1162825).
• CVE-2020-8492: Fixed a regular expression in urrlib that was prone to denial of service via HTTP (bsc#1162367).

Non-security issue fixed:

• If the locale is 'C', coerce it to C.UTF-8 (bsc#1162423).

This update was imported from the SUSE:SLE-15:Update update project.

This update for python3 fixes the following issues:

• Fixed CVE-2020-27619 (bsc#1178009), where Lib/test/multibytecodec_support calls eval() on content retrieved via HTTP.
• Change setuptools and pip version numbers according to new wheels
• Handful of changes to make python36 compatible with SLE15 and SLE12 (jsc#ECO-2799, jsc#SLE-13738)
• add triplets for mips-r6 and riscv
• RISC-V needs CTYPES_PASS_BY_REF_HACK

Update to 3.6.12 (bsc#1179193)

• Ensure python3.dll is loaded from correct locations when Python is embedded
• The hash() methods of ipaddress.IPv4Interface and ipaddress.IPv6Interface incorrectly generated constant hash values of 32 and 128 respectively. This resulted in always causing hash collisions. The fix uses hash() to generate hash values for the tuple of (address, mask length, network address).
• Prevent http header injection by rejecting control characters in http.client.putrequest(…).
• Unpickling invalid NEWOBJ_EX opcode with the C implementation raises now UnpicklingError instead of crashing.
• Avoid infinite loop when reading specially crafted TAR files using the tarfile module

• This release also fixes CVE-2020-26116 (bsc#1177211) and CVE-2019-20907 (bsc#1174091).

Update to 3.6.11:

• Disallow CR or LF in email.headerregistry. Address arguments to guard against header injection attacks.
• Disallow control characters in hostnames in http.client, addressing CVE-2019-18348. Such potentially malicious header injection URLs now cause a InvalidURL to be raised. (bsc#1155094)
• CVE-2020-8492: The AbstractBasicAuthHandler class of the urllib.request module uses an inefficient regular expression which can be exploited by an attacker to cause a denial of service. Fix the regex to prevent the catastrophic backtracking. Vulnerability reported by Ben Caller and Matt Schwager.

This update was imported from the SUSE:SLE-15:Update update project.

This update for python3 fixes the following issues:

• Fixed CVE-2020-27619 (bsc#1178009), where Lib/test/multibytecodec_support calls eval() on content retrieved via HTTP.
• Change setuptools and pip version numbers according to new wheels
• Handful of changes to make python36 compatible with SLE15 and SLE12 (jsc#ECO-2799, jsc#SLE-13738)
• add triplets for mips-r6 and riscv
• RISC-V needs CTYPES_PASS_BY_REF_HACK

Update to 3.6.12 (bsc#1179193)

• Ensure python3.dll is loaded from correct locations when Python is embedded
• The hash() methods of ipaddress.IPv4Interface and ipaddress.IPv6Interface incorrectly generated constant hash values of 32 and 128 respectively. This resulted in always causing hash collisions. The fix uses hash() to generate hash values for the tuple of (address, mask length, network address).
• Prevent http header injection by rejecting control characters in http.client.putrequest(…).
• Unpickling invalid NEWOBJ_EX opcode with the C implementation raises now UnpicklingError instead of crashing.
• Avoid infinite loop when reading specially crafted TAR files using the tarfile module

• This release also fixes CVE-2020-26116 (bsc#1177211) and CVE-2019-20907 (bsc#1174091).

Update to 3.6.11:

• Disallow CR or LF in email.headerregistry. Address arguments to guard against header injection attacks.
• Disallow control characters in hostnames in http.client, addressing CVE-2019-18348. Such potentially malicious header injection URLs now cause a InvalidURL to be raised. (bsc#1155094)
• CVE-2020-8492: The AbstractBasicAuthHandler class of the urllib.request module uses an inefficient regular expression which can be exploited by an attacker to cause a denial of service. Fix the regex to prevent the catastrophic backtracking. Vulnerability reported by Ben Caller and Matt Schwager.

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the python-2.7.18-8.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python310-3.10.0rc1-4.2 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python36-3.6.15-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python38-3.8.12-1.2 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python39-3.9.7-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python311-3.11.0b1-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python312-3.12.0a7-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python313-3.13.0~b3-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python314-3.14.0~a1-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python315-3.15.0~a1-1.1 package on the GA media of openSUSE Tumbleweed.

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

This feature update for venv-salt-minion provides the following changes:

• Introduce venv-salt-minion.
• Track already fixed issues.

This feature update for venv-salt-minion provides the following changes:

• Introduce venv-salt-minion.
• Mention fixed issues provided with the bundle.

This update for python3 fixes the following issues:

Security issues fixed:

• CVE-2019-9674: Improved the documentation to reflect the dangers of zip-bombs (bsc#1162825).
• CVE-2020-8492: Fixed a regular expression in urrlib that was prone to denial of service via HTTP (bsc#1162367).

Non-security issue fixed:

• If the locale is 'C', coerce it to C.UTF-8 (bsc#1162423).

This update for python fixes the following issues:

Security issues fixed:

• CVE-2019-9674: Improved the documentation, warning about dangers of zip-bombs (bsc#1162825).
• CVE-2020-8492: Fixed a regular expression in urrlib that was prone to denial of service via HTTP (bsc#1162367).

This update for python36 fixes the following issues:

Security issues fixed:

• CVE-2019-9674: Improved the documentation to reflect the dangers of zip-bombs (bsc#1162825).
• CVE-2020-8492: Fixed a regular expression in urrlib that was prone to denial of service via HTTP (bsc#1162367).

Non-security issue fixed:

• If the locale is 'C', coerce it to C.UTF-8 (bsc#1162423).

This update for python3 fixes the following issue:

• CVE-2019-18348: Fixed a CRLF injection via the host part of the url passed to urlopen(). Now an InvalidURL exception is raised (bsc#1155094).
• CVE-2019-9674: Improved the documentation to reflect the dangers of zip-bombs (bsc#1162825).
• CVE-2020-8492: Fixed a regular expression in urllib that was prone to denial of service via HTTP (bsc#1162367).
• Fixed an issue with version missmatch (bsc#1162224).
• Rename idle icons to idle3 in order to not conflict with python2 variant of the package. (bsc#1165894)

This update for python fixes the following security issue:

• CVE-2020-8492: Fixed a regular expression in urllib that was prone to denial of service via HTTP (bsc#1162367).

This update for python to version 2.7.17 fixes the following issues:

Syncing with lots of upstream bug fixes and security fixes.

Bug fixes:

• CVE-2019-9674: Improved the documentation to reflect the dangers of zip-bombs (bsc#1162825).
• CVE-2019-18348: Fixed a CRLF injection via the host part of the url passed to urlopen(). Now an InvalidURL exception is raised (bsc#1155094).
• CVE-2020-8492: Fixed a regular expression in urllib that was prone to denial of service via HTTP (bsc#1162367).
• Fixed mismatches between libpython and python-base versions (bsc#1162224).
• Fixed segfault in libpython2.7.so.1 (bsc#1073748).
• Unified packages among openSUSE:Factory and SLE versions (bsc#1159035).
• Added idle.desktop and idle.appdata.xml to provide IDLE in menus (bsc#1153830).
• Excluded tsl_check files from python-base to prevent file conflict with python-strict-tls-checks package (bsc#945401).
• Changed the name of idle3 icons to idle3.png to avoid collision with Python 2 version (bsc#1165894).

Additionally a new 'shared-python-startup' package is provided containing startup files.

python-rpm-macros was updated to fix:

• Do not write .pyc files for tests (bsc#1171561)

This update for python36 fixes the following issues:

Update to 3.6.12, including the following fixes:

• Fixed a directory traversal in _download_http_url() (bsc#1176262 CVE-2019-20916)
• Fixed CRLF injection via HTTP request method in httplib/http.client (bsc#1177211 CVE-2020-26116)
• Fixed possible infinite loop in specifically crafted tarball (bsc#1174091 CVE-2019-20907)
• Fixed a CRLF injection via the host part of the url passed to urlopen() (bsc#1155094 CVE-2019-18348)
• Reamed idle icons to idle3 in order to avoid conflicts with python2 (bsc#1165894)
• Handful of compatibility changes between SLE15 and SLE12 (jsc#ECO-2799, jsc#SLE-13738, bsc#1179193)

This update for python36 fixes the following issues:

• CVE-2019-18348: Fixed a CRLF injection via the host part of the url passed to urlopen() (bsc#1155094)
• CVE-2019-20916: Fixed a directory traversal in _download_http_url() (bsc#1176262).
• CVE-2020-27619: Fixed an issue where the CJK codec tests call eval() on content retrieved via HTTP (bsc#1178009).
• CVE-2020-8492: Fixed a regular expression in urrlib that was prone to denial of service via HTTP (bsc#1162367).
• Working-around missing python-packaging dependency in python-Sphinx is not necessary anymore (bsc#1174571).
• Build of python3 documentation is not independent on the version of Sphinx(bsc#1179630).

This update for python3 fixes the following issues:

• Fixed CVE-2020-27619 (bsc#1178009), where Lib/test/multibytecodec_support calls eval() on content retrieved via HTTP.
• Change setuptools and pip version numbers according to new wheels
• Handful of changes to make python36 compatible with SLE15 and SLE12 (jsc#ECO-2799, jsc#SLE-13738)
• add triplets for mips-r6 and riscv
• RISC-V needs CTYPES_PASS_BY_REF_HACK

Update to 3.6.12 (bsc#1179193)

• Ensure python3.dll is loaded from correct locations when Python is embedded
• The hash() methods of ipaddress.IPv4Interface and ipaddress.IPv6Interface incorrectly generated constant hash values of 32 and 128 respectively. This resulted in always causing hash collisions. The fix uses hash() to generate hash values for the tuple of (address, mask length, network address).
• Prevent http header injection by rejecting control characters in http.client.putrequest(…).
• Unpickling invalid NEWOBJ_EX opcode with the C implementation raises now UnpicklingError instead of crashing.
• Avoid infinite loop when reading specially crafted TAR files using the tarfile module

• This release also fixes CVE-2020-26116 (bsc#1177211) and CVE-2019-20907 (bsc#1174091).

Update to 3.6.11:

• Disallow CR or LF in email.headerregistry. Address arguments to guard against header injection attacks.
• Disallow control characters in hostnames in http.client, addressing CVE-2019-18348. Such potentially malicious header injection URLs now cause a InvalidURL to be raised. (bsc#1155094)
• CVE-2020-8492: The AbstractBasicAuthHandler class of the urllib.request module uses an inefficient regular expression which can be exploited by an attacker to cause a denial of service. Fix the regex to prevent the catastrophic backtracking. Vulnerability reported by Ben Caller and Matt Schwager.

This update for python3 fixes the following issues:

• CVE-2022-37454: Fixed a buffer overflow in hashlib.sha3_* implementations. (bsc#1204577)
• CVE-2020-10735: Fixed a bug to limit amount of digits converting text to int and vice vera. (bsc#1203125)

The following non-security bug was fixed:

• Fixed a crash in the garbage collection (bsc#1188607).

It was discovered that Python incorrectly stripped certain characters from requests. A remote attacker could use this issue to perform CRLF injection. (CVE-2019-18348)

It was discovered that Python incorrectly handled certain HTTP requests. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-8492)

USN-4333-1 fixed vulnerabilities in Python. This update provides the corresponding update for Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that Python incorrectly stripped certain characters from requests. A remote attacker could use this issue to perform CRLF injection. (CVE-2019-18348)

It was discovered that Python incorrectly handled certain HTTP requests. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-8492)

USN-4754-1 fixed vulnerabilities in Python. This update provides the corresponding updates for Ubuntu 18.04 and Ubuntu 20.04.

In the case of Python 2.7 for 20.04, these additional fixes are included:

It was dicovered that Python allowed remote attackers to cause a denial of service (resource consumption) via a ZIP bomb. (CVE-2019-9674)

It was discovered that Python had potentially misleading information about whether sorting occurs. This fix updates the documentation about it. (CVE-2019-17514)

It was discovered that Python incorrectly handled certain TAR archives. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-20907)

It was discovered that Python allowed an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking. (CVE-2020-8492)

It was discovered that Python allowed CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of HTTPConnection.request. (CVE-2020-26116)

Original advisory details:

It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service. (CVE-2020-27619, CVE-2021-3177)

It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex allowing for catastrophic backtracking. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2020-8492)

It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex with a quadratic worst-case time complexity. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2021-3733)

It was discovered that the Python urllib http client could enter into an infinite loop when incorrectly handling certain server responses (100 Continue response). Specially crafted traffic from a malicious HTTP server could cause a denial of service (DoS) condition for a client. (CVE-2021-3737)

It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS. (CVE-2015-20107)

It was discovered that Python incorrectly used regular expressions vulnerable to catastrophic backtracking. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2018-1060, CVE-2018-1061)

It was discovered that Python failed to initialize Expat’s hash salt. A remote attacker could possibly use this issue to cause hash collisions, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2018-14647)

It was discovered that Python incorrectly handled certain pickle files. An attacker could possibly use this issue to consume memory, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2018-20406)

It was discovered that Python incorrectly validated the domain when handling cookies. An attacker could possibly trick Python into sending cookies to the wrong domain. This issue only affected Ubuntu 14.04 LTS. (CVE-2018-20852)

Jonathan Birch and Panayiotis Panayiotou discovered that Python incorrectly handled Unicode encoding during NFKC normalization. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-9636, CVE-2019-10160)

It was discovered that Python incorrectly parsed certain email addresses. A remote attacker could possibly use this issue to trick Python applications into accepting email addresses that should be denied. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-16056)

It was discovered that the Python documentation XML-RPC server incorrectly handled certain fields. A remote attacker could use this issue to execute a cross-site scripting (XSS) attack. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-16935)

It was discovered that Python documentation had a misleading information. A security issue could be possibly caused by wrong assumptions of this information. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-17514)

It was discovered that Python incorrectly stripped certain characters from requests. A remote attacker could use this issue to perform CRLF injection. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-18348)

It was discovered that Python incorrectly handled certain TAR archives. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-20907)

Colin Read and Nicolas Edet discovered that Python incorrectly handled parsing certain X509 certificates. An attacker could possibly use this issue to cause Python to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-5010)

It was discovered that incorrectly handled certain ZIP files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-9674)

It was discovered that Python incorrectly handled certain urls. A remote attacker could possibly use this issue to perform CRLF injection attacks. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-9740, CVE-2019-9947)

Sihoon Lee discovered that Python incorrectly handled the local_file: scheme. A remote attacker could possibly use this issue to bypass blocklist meschanisms. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-9948)

It was discovered that Python incorrectly handled certain IP values. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-14422)

It was discovered that Python incorrectly handled certain character sequences. A remote attacker could possibly use this issue to perform CRLF injection. This issue only affected Ubuntu 14.04 LTS and Ubuntu…