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Debian LTS Advisory DLA-3471-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                         Anton Gladky
June 26, 2023                                 https://wiki.debian.org/LTS
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Package        : c-ares
Version        : 1.14.0-1+deb10u3
CVE ID         : CVE-2023-31130 CVE-2023-32067

Two vunerabilities were discovered in c-ares, an asynchronous name
resolver library:

CVE-2023-31130

    ares_inet_net_pton() is found to be vulnerable to a buffer underflow
    for certain ipv6 addresses, in particular "0::00:00:00/2" was found
    to cause an issue. c-ares only uses this function internally for
    configuration purposes, however external usage for other purposes may
    cause more severe issues.

CVE-2023-32067

    Target resolver may erroneously interprets a malformed UDP packet
    with a length of 0 as a graceful shutdown of the connection, which
    could cause a denial of service.

For Debian 10 buster, these problems have been fixed in version
1.14.0-1+deb10u3.

We recommend that you upgrade your c-ares packages.

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

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