CVE-2021-34798

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive).(CVE-2021-36160)

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.(CVE-2021-34798)

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.(CVE-2021-40438)

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

Security Fix(es):

• httpd: NULL pointer dereference via malformed requests (CVE-2021-34798)

• httpd: Out-of-bounds write in ap_escape_quotes() via malicious input (CVE-2021-39275)

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.

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.

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

Security Fix(es):

• httpd: NULL pointer dereference via malformed requests (CVE-2021-34798)

• httpd: Out-of-bounds write in ap_escape_quotes() via malicious input (CVE-2021-39275)

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.

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.

• SECURITY UPDATE: Buffer overflow with crafted input
  • debian/patches/CVE-2021-39275.patch:ap_escape_quotes() may write beyond the end of a buffer when given malicious input
  • CVE-2021-39275
• SECURITY UPDATE: Malformed requests may cause the server to dereference a NULL pointer
  • debian/patches/CVE-2021-34798.patch: prevent ap_increment_counts() from pointer dereference without check
  • CVE-2021-34798
• SECURITY UPDATE: A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user.
  • debian/patches/CVE-2021-40438.patch: add checks for the configured UDS path
  • CVE-2021-40438

• CVE-2021-44224: possible NULL dereference or SSRF in forward proxy configurations
• CVE-2021-39275: out-of-bounds write in ap_escape_quotes() via malicious input
• CVE-2021-36160: mod_proxy_uwsgi: out-of-bounds read via a crafted request uri-path
• CVE-2021-34798: NULL pointer dereference via malformed requests

• CVE-2021-44224: possible NULL dereference or SSRF in forward proxy configurations
• CVE-2021-39275: out-of-bounds write in ap_escape_quotes() via malicious input
• CVE-2021-36160: mod_proxy_uwsgi: out-of-bounds read via a crafted request uri-path
• CVE-2021-34798: NULL pointer dereference via malformed requests

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-2021-40438: 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)

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

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)

This update for apache2 fixes the following issues:

• CVE-2021-40438: Fixed a SRF via a crafted request uri-path. (bsc#1190703)
• 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)

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)

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)

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)

USN-5090-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

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)

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)