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Debian LTS Advisory DLA-3952-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                       Daniel Leidert
November 14, 2024                             https://wiki.debian.org/LTS
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Package        : unbound
Version        : 1.13.1-1+deb11u4
CVE ID         : CVE-2024-8508
Debian Bug     : 1083282

A vulnerability has been discovered in unbound, a validating,
recursive, caching DNS resolver. Malicious upstreams responses with
very large RRsets can cause Unbound to spend a considerable time
applying name compression to downstream replies. This can lead to
degraded performance and eventually denial of service in well
orchestrated attacks. The vulnerability can be exploited by a malicious
actor querying Unbound for the specially crafted contents of a
malicious zone with very large RRsets.

For Debian 11 bullseye, this problem has been fixed in version
1.13.1-1+deb11u4.

We recommend that you upgrade your unbound packages.

For the detailed security status of unbound please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/unbound

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