CVE-2020-8517

An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

• CVE-2020-8449: fix improper HTTP request validation allowing access to resources which are prohibited by security filters
• CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow
• CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer and leading to denial of service

• CVE-2020-15049: fix incorrect validation of Content-Length field leading to Http smuggling and Poisoning attack
• CVE-2020-14058: fix handling of unknown SSL errors which resulted in denial of service
• CVE-2020-25097: fix improper input validation allowing HTTP smuggling from trusted client
• CVE-2020-11945: fix nonce reference counter overflow allowing replay attack
• CVE-2020-24606: fix handle of EOF in peerDigestHandleReply() leading to Denial of service
• CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer and leading to denial of service
• CVE-2020-8449: fix improper HTTP request validation allowing access to resources which are prohibited by security filters
• CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow
• CVE-2021-28651: fix memory leak leading to denial of service

• CVE-2020-8449: fix improper HTTP request validation allowing access to resources which are prohibited by security filters
• CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow
• CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer and leading to denial of service

• CVE-2020-15049: fix incorrect validation of Content-Length field leading to Http smuggling and Poisoning attack
• CVE-2020-14058: fix handling of unknown SSL errors which resulted in denial of service
• CVE-2020-25097: fix improper input validation allowing HTTP smuggling from trusted client
• CVE-2020-11945: fix nonce reference counter overflow allowing replay attack
• CVE-2020-24606: fix handle of EOF in peerDigestHandleReply() leading to Denial of service
• CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer and leading to denial of service
• CVE-2020-8449: fix improper HTTP request validation allowing access to resources which are prohibited by security filters
• CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow
• CVE-2021-28651: fix memory leak leading to denial of service

• SECURITY UPDATE: potential Denial of Service via TLS connection
  • debian/patches/CVE-2020-14058.patch: Fix sending of unknown validation errors to cert validator
  • CVE-2020-14058
• SECURITY UPDATE: improper Validation of Specified Index leads to Denial of Service via TLS Handshake vulnerability
  • debian/patches/CVE-2023-46724.patch: Fix validation of certificates with CN=* due to Buffer UnderRead in SSL CN Parsing issue (#1523)
  • CVE-2023-46724
• SECURITY UPDATE: denial of Service vulnerability in HTTP Chunked decoder due to uncontrolled recursion bug
  • debian/patches/CVE-2024-25111.patch: Fix infinite recursion when parsing HTTP chunks, prevent progress in call chain by stopping HttpStateData recursion
  • CVE-2024-25111
• SECURITY UPDATE: denial of Service vulnerability in the NTLM authentication credentials parser due to incorrect input validation
  • debian/patches/CVE-2020-8517.patch: Fix incorrect input validation allowing writing outside of buffer and leading to denial of service
  • CVE-2020-8517
• SECURITY UPDATE: denial of Service vulnerability against HTTP header parsing due to a Collapse of Data into Unsafe Value
  • debian/patches/CVE-2024-25617.patch: Improve handling of expanding HTTP header values to prevent DoS
  • CVE-2024-25617
• SECURITY UPDATE: denial of Service vulnerability by a trusted server
  • debian/rules: Disable ESI due to unfixed multiple issues in ESI causing DoS by a trusted server
  • debian/control: Remove dependencies used by ESI
  • CVE-2024-45802

Updated squid packages fix security vulnerabilities:

Jeriko One discovered that Squid incorrectly handled memory when connected to an FTP server. A remote attacker could possibly use this issue to obtain sensitive information from Squid memory (CVE-2019-12528).

Regis Leroy discovered that Squid incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to access server resources prohibited by earlier security filters (CVE-2020-8449).

Guido Vranken discovered that Squid incorrectly handled certain buffer operations when acting as a reverse proxy. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code (CVE-2020-8450).

Aaron Costello discovered that Squid incorrectly handled certain NTLM authentication credentials. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service (CVE-2020-8517).

This update for squid to version 4.10 fixes the following issues:

Security issues fixed:

• CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).
• CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).

Non-security issue fixed:

• Improved cache handling with chunked responses.

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

This update for squid to version 4.10 fixes the following issues:

Security issues fixed:

• CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).
• CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).

Non-security issue fixed:

• Improved cache handling with chunked responses.

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

This update for squid to version 4.11 fixes the following issues:

• CVE-2020-11945: Fixed a potential remote code execution vulnerability when using HTTP Digest Authentication (bsc#1170313).
• CVE-2019-12519, CVE-2019-12521: Fixed incorrect buffer handling that can result in cache poisoning, remote execution, and denial of service attacks when processing ESI responses (bsc#1169659).
• CVE-2020-8517: Fixed a possible denial of service caused by incorrect buffer management ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).
• CVE-2019-12528: Fixed possible information disclosure when translating FTP server listings into HTTP responses (bsc#1162689).
• CVE-2019-18860: Fixed handling of invalid domain names in cachemgr.cgi (bsc#1167373).

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

These are all security issues fixed in the squid-4.16-1.5 package on the GA media of openSUSE Tumbleweed.

This update for squid to version 4.10 fixes the following issues:

Security issues fixed:

• CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).
• CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).

Non-security issue fixed:

• Improved cache handling with chunked responses.

This update for squid to version 4.10 fixes the following issues:

Security issues fixed:

• CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).
• CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).

Non-security issue fixed:

• Improved cache handling with chunked responses.

This update for squid fixes the following issues:

• CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).
• CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).
• CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).
• CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).
• CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).
• CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).
• CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).
• CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).

This update for squid to version 4.11 fixes the following issues:

• CVE-2020-11945: Fixed a potential remote code execution vulnerability when using HTTP Digest Authentication (bsc#1170313).
• CVE-2019-12519, CVE-2019-12521: Fixed incorrect buffer handling that can result in cache poisoning, remote execution, and denial of service attacks when processing ESI responses (bsc#1169659).
• CVE-2020-8517: Fixed a possible denial of service caused by incorrect buffer management ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).
• CVE-2019-12528: Fixed possible information disclosure when translating FTP server listings into HTTP responses (bsc#1162689).
• CVE-2019-18860: Fixed handling of invalid domain names in cachemgr.cgi (bsc#1167373).

This update for squid to version 4.11 fixes the following issues:

• CVE-2020-11945: Fixed a potential remote code execution vulnerability when using HTTP Digest Authentication (bsc#1170313).
• CVE-2019-12519, CVE-2019-12521: Fixed incorrect buffer handling that can result in cache poisoning, remote execution, and denial of service attacks when processing ESI responses (bsc#1169659).
• CVE-2020-8517: Fixed a possible denial of service caused by incorrect buffer management ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).
• CVE-2019-12528: Fixed possible information disclosure when translating FTP server listings into HTTP responses (bsc#1162689).
• CVE-2019-18860: Fixed handling of invalid domain names in cachemgr.cgi (bsc#1167373).

This update for squid3 fixes the following issues:

• Fixed a Cache Poisoning and Request Smuggling attack (CVE-2020-15049, bsc#1173455)

• Fixed incorrect buffer handling that can result in cache poisoning, remote execution, and denial of service attacks when processing ESI responses (CVE-2019-12519, CVE-2019-12521, bsc#1169659)

• Fixed handling of hostname in cachemgr.cgi (CVE-2019-18860, bsc#1167373)

• Fixed a potential remote execution vulnerability when using HTTP Digest Authentication (CVE-2020-11945, bsc#1170313)

• Fixed a potential ACL bypass, cache-bypass and cross-site scripting attack when processing invalid HTTP Request messages (CVE-2019-12520, CVE-2019-12524, bsc#1170423)

• Fixed a potential denial of service when processing TLS certificates during HTTPS connections (CVE-2020-14059, bsc#1173304)

• Fixed a potential denial of service associated with incorrect buffer management of HTTP Basic Authentication credentials (bsc#1141329, CVE-2019-12529)

• Fixed an incorrect buffer management resulting in vulnerability to a denial of service during processing of HTTP Digest Authentication credentials (bsc#1141332, CVE-2019-12525)

• Fix XSS via user_name or auth parameter in cachemgr.cgi (bsc#1140738, CVE-2019-13345)

• Fixed a potential code execution vulnerability (CVE-2019-12526, bsc#1156326)

• Fixed HTTP Request Splitting in HTTP message processing and information disclosure in HTTP Digest Authentication (CVE-2019-18678, CVE-2019-18679, bsc#1156323, bsc#1156324)

• Fixed a security issue allowing a remote client ability to cause use a buffer overflow when squid is acting as reverse-proxy. (CVE-2020-8449, CVE-2020-8450, bsc#1162687)

• Fixed a security issue allowing for information disclosure in FTP gateway (CVE-2019-12528, bsc#1162689)

• Fixed a security issue in ext_lm_group_acl when processing NTLM Authentication credentials. (CVE-2020-8517, bsc#1162691)

• Fixed Cross-Site Request Forgery in HTTP Request processing (CVE-2019-18677, bsc#1156328)

• Disable urn parsing and parsing of unknown schemes (bsc#1156329, CVE-2019-12523, CVE-2019-18676)

Jeriko One discovered that Squid incorrectly handled memory when connected to an FTP server. A remote attacker could possibly use this issue to obtain sensitive information from Squid memory. (CVE-2019-12528)

Regis Leroy discovered that Squid incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to access server resources prohibited by earlier security filters. (CVE-2020-8449)

Guido Vranken discovered that Squid incorrectly handled certain buffer operations when acting as a reverse proxy. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-8450)

Aaron Costello discovered that Squid incorrectly handled certain NTLM authentication credentials. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2020-8517)