- ------------------------------------------------------------------------- Debian LTS Advisory DLA-2776-1 [email protected] https://www.debian.org/lts/security/ Sylvain Beucler October 02, 2021 https://wiki.debian.org/LTS - ------------------------------------------------------------------------- Package : apache2 Version : 2.4.25-3+deb9u11 CVE ID : CVE-2021-34798 CVE-2021-39275 CVE-2021-40438 Several vulnerabilities were discovered in the Apache HTTP server. An attacker could send proxied requests to arbitrary servers, corrupt memory in some setups involving third-party modules, and cause the server to crash. CVE-2021-34798 Malformed requests may cause the server to dereference a NULL pointer. CVE-2021-39275 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-2021-40438 A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. For Debian 9 stretch, these problems have been fixed in version 2.4.25-3+deb9u11. We recommend that you upgrade your apache2 packages. For the detailed security status of apache2 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/apache2 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS