CVE-2020-8450

An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.

Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.

The following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)

Security Fix(es):

• squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)

• squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)

• squid: Improper input validation in URI processor (CVE-2019-12523)

• squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)

• squid: Heap overflow issue in URN processing (CVE-2019-12526)

• squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)

• squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)

• squid: Denial of service in cachemgr.cgi (CVE-2019-12854)

• squid: Buffer overflow in URI processor (CVE-2019-18676)

• squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)

• squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)

• squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)

• squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)

• squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)

• squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)

• squid: DoS in TLS handshake (CVE-2020-14058)

• squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)

• squid: Improper input validation could result in a DoS (CVE-2020-24606)

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.

An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.

Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.

The following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)

Security Fix(es):

• squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)

• squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)

• squid: Improper input validation in URI processor (CVE-2019-12523)

• squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)

• squid: Heap overflow issue in URN processing (CVE-2019-12526)

• squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)

• squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)

• squid: Denial of service in cachemgr.cgi (CVE-2019-12854)

• squid: Buffer overflow in URI processor (CVE-2019-18676)

• squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)

• squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)

• squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)

• squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)

• squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)

• squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)

• squid: DoS in TLS handshake (CVE-2020-14058)

• squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)

• squid: Improper input validation could result in a DoS (CVE-2020-24606)

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.

• 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

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 4.10 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 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)