A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-44224
• http://httpd.apache.org/security/vulnerabilities_24.html
• http://www.openwall.com/lists/oss-security/2021/12/20/3
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
• https://security.netapp.com/advisory/ntap-20211224-0001/
• https://www.debian.org/security/2022/dsa-5035
• https://www.tenable.com/security/tns-2022-01
• https://www.tenable.com/security/tns-2022-03
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://support.apple.com/kb/HT213255
• https://support.apple.com/kb/HT213256
• https://support.apple.com/kb/HT213257
• http://seclists.org/fulldisclosure/2022/May/33
• http://seclists.org/fulldisclosure/2022/May/35
• http://seclists.org/fulldisclosure/2022/May/38
• https://security.gentoo.org/glsa/202208-20