Debian Security Advisory
DLA-2776-1 apache2 -- LTS security update
- Date Reported:
- 02 Oct 2021
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2021-34798, CVE-2021-39275, CVE-2021-40438.
- More information:
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.
Malformed requests may cause the server to dereference a NULL pointer.
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.
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