| Description: | Summary:
The remote host is missing an update for the Debian 'apache2' package(s) announced via the DLA-2776-1 advisory.
Vulnerability Insight:
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 chosen 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: [link moved to references]
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references]
Affected Software/OS:
'apache2' package(s) on Debian 9.
Solution:
Please install the updated package(s).
CVSS Score:
7.5
CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P
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