CVE-2021-33620

Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.

Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.

Security Fix(es):

Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.(CVE-2021-33620)

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.(CVE-2021-31806)

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP Range request to trigger this.(CVE-2021-31808)

An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in benign network traffic.(CVE-2021-28662)

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.(CVE-2021-28651)

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.(CVE-2021-28652)

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 (4.15). (BZ#1964384)

Security Fix(es):

• squid: denial of service in URN processing (CVE-2021-28651)

• squid: denial of service issue in Cache Manager (CVE-2021-28652)

• squid: denial of service in HTTP response processing (CVE-2021-28662)

• squid: improper input validation in HTTP Range header (CVE-2021-31806)

• squid: incorrect memory management in HTTP Range header (CVE-2021-31807)

• squid: integer overflow in HTTP Range header (CVE-2021-31808)

• squid: denial of service in HTTP response processing (CVE-2021-33620)

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 8.5 Release Notes linked from the References section.

Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.

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 (4.15). (BZ#1964384)

Security Fix(es):

• squid: denial of service in URN processing (CVE-2021-28651)

• squid: denial of service issue in Cache Manager (CVE-2021-28652)

• squid: denial of service in HTTP response processing (CVE-2021-28662)

• squid: improper input validation in HTTP Range header (CVE-2021-31806)

• squid: incorrect memory management in HTTP Range header (CVE-2021-31807)

• squid: integer overflow in HTTP Range header (CVE-2021-31808)

• squid: denial of service in HTTP response processing (CVE-2021-33620)

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-2021-28651: Fix memory leak that perform DoS via buffer-management bug
• CVE-2021-28652: Fix cache manager URL parsing that perform DoS via incorrect parser validation
• CVE-2021-28662: Add limit HeaderLookupTable_t::lookup() to BadHdr and specific IDs that perform DoS via certain response header
• CVE-2021-31806: Add handling more partial responses that perform DoS via HTTP Range request
• CVE-2021-31807: Add handling more partial responses that perform DoS via HTTP Range request
• CVE-2021-31808: Add handling more partial responses that perform DoS via HTTP Range request
• CVE-2021-33620: Add handling more partial responses that perform DoS via HTTP response

• CVE-2021-28651: fix memory leak in RFC 2169 response parsing
• CVE-2021-28652: fix broken cache manager URL parsing
• CVE-2021-31806: fix memory management bug
• CVE-2021-31807: fix integer overflow problem
• CVE-2021-31808: fix input validation bug
• CVE-2021-33620: handle more partial responses

Updated squid packages fix security vulnerabilities:

Due to improper input validation Squid is vulnerable to an HTTP Request Smuggling attack. This problem allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by Squid security controls (CVE-2020-25097).

Joshua Rogers discovered that Squid incorrectly handled requests with the urn: scheme. A remote attacker could possibly use this issue to causeSquid to consume resources, leading to a denial of service (CVE-2021-28651).

Joshua Rogers discovered that Squid incorrectly handled requests to the Cache Manager API. A remote attacker with access privileges could possibly use this issue to cause Squid to consume resources, leading to a denial of service (CVE-2021-28652).

Joshua Rogers discovered that Squid incorrectly handled certain response headers. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service (CVE-2021-28662).

Joshua Rogers discovered that Squid incorrectly handled range request processing. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service (CVE-2021-31806, CVE-2021-31807, CVE-2021-31808).

Joshua Rogers discovered that Squid incorrectly handled certain HTTP responses. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service (CVE-2021-33620).

The squid package has been updated to version 4.15, fixing theese issues and other bugs.

These are all security issues fixed in the squid-5.4.1-2.1 package on the GA media of openSUSE Tumbleweed.

This update for squid fixes the following issues:

• CVE-2021-46784: Fixed DoS when processing gopher server responses. (bsc#1200907)
• CVE-2021-33620: Fixed DoS in HTTP Response processing (bsc#1185923, bsc#1186654)

This update for squid fixes the following issues:

• CVE-2021-46784: Fixed DoS when processing gopher server responses. (bsc#1200907)
• CVE-2021-33620: Fixed DoS in HTTP Response processing (bsc#1185923, bsc#1186654)

Joshua Rogers discovered that Squid incorrectly handled requests with the urn: scheme. A remote attacker could possibly use this issue to cause Squid to consume resources, leading to a denial of service. (CVE-2021-28651)

Joshua Rogers discovered that Squid incorrectly handled requests to the Cache Manager API. A remote attacker with access privileges could possibly use this issue to cause Squid to consume resources, leading to a denial of service. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28652)

Joshua Rogers discovered that Squid incorrectly handled certain response headers. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue was only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28662)

Joshua Rogers discovered that Squid incorrectly handled range request processing. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-31806, CVE-2021-31807, CVE-2021-31808)

Joshua Rogers discovered that Squid incorrectly handled certain HTTP responses. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-33620)