CVE-2021-33193

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Request splitting via HTTP/2 method injection and mod_proxy (CVE-2021-33193)

• httpd: mod_proxy_uwsgi: out-of-bounds read via a crafted request uri-path (CVE-2021-36160)

• httpd: possible NULL dereference or SSRF in forward proxy configurations (CVE-2021-44224)

• httpd: Single zero byte stack overflow in mod_auth_digest (CVE-2020-35452)

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 8.6 Release Notes linked from the References section.

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Request splitting via HTTP/2 method injection and mod_proxy (CVE-2021-33193)

• httpd: mod_proxy_uwsgi: out-of-bounds read via a crafted request uri-path (CVE-2021-36160)

• httpd: possible NULL dereference or SSRF in forward proxy configurations (CVE-2021-44224)

• httpd: Single zero byte stack overflow in mod_auth_digest (CVE-2020-35452)

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.

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

• CVE-2020-35452: mod_auth_digest: fix a single zero byte stack overflow (#1968278)
• CVE-2021-33193: fix request splitting via HTTP/2 method injection and mod_proxy (#1972491)

• CVE-2020-35452: mod_auth_digest: fix a single zero byte stack overflow (#1968278)
• CVE-2021-33193: fix request splitting via HTTP/2 method injection and mod_proxy (#1972491)

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. (CVE-2021-33193)

Malformed requests may cause the server to dereference a NULL pointer. (CVE-2021-34798)

A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS). (CVE-2021-36160)

ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. (CVE-2021-39275)

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. (CVE-2021-40438)

This update for apache2 fixes the following issues:

• CVE-2021-33193: Fixed request splitting via HTTP/2 method injection and mod_proxy (bsc#1189387).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for apache2 fixes the following issues:

• CVE-2021-33193: Fixed request splitting via HTTP/2 method injection and mod_proxy (bsc#1189387).

This update for apache2 fixes the following issues:

• CVE-2021-33193: Fixed request splitting via HTTP/2 method injection and mod_proxy (bsc#1189387).

This update for apache2 fixes the following issues:

• CVE-2021-33193: Fixed request splitting via HTTP/2 method injection and mod_proxy (bsc#1189387).

This update for apache2 fixes the following issues:

• CVE-2021-40438: Fixed a SRF via a crafted request uri-path. (bsc#1190703)
• CVE-2021-36160: Fixed an out-of-bounds read via a crafted request uri-path. (bsc#1190702)
• CVE-2021-39275: Fixed an out-of-bounds write in ap_escape_quotes() via malicious input. (bsc#1190666)
• CVE-2021-34798: Fixed a NULL pointer dereference via malformed requests. (bsc#1190669)
• CVE-2021-33193: Fixed request splitting via HTTP/2 method injection and mod_proxy. (bsc#1189387)

James Kettle discovered that the Apache HTTP Server HTTP/2 module incorrectly handled certain crafted methods. A remote attacker could possibly use this issue to perform request splitting or cache poisoning attacks. (CVE-2021-33193)

It was discovered that the Apache HTTP Server incorrectly handled certain malformed requests. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2021-34798)

Li Zhi Xin discovered that the Apache mod_proxy_uwsgi module incorrectly handled certain request uri-paths. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 21.04. (CVE-2021-36160)

It was discovered that the Apache HTTP Server incorrectly handled escaping quotes. If the server was configured with third-party modules, a remote attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-39275)

It was discovered that the Apache mod_proxy module incorrectly handled certain request uri-paths. A remote attacker could possibly use this issue to cause the server to forward requests to arbitrary origin servers. (CVE-2021-40438)