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Medium ALSA-2023:6635 4 CVEs

Moderate: c-ares security, bug fix, and enhancement update

Published Nov 7, 2023 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The c-ares C library defines asynchronous DNS (Domain Name System) requests and provides name resolving API.

The following packages have been upgraded to a later upstream version: c-ares (1.19.1). (BZ#2210370)

Security Fix(es):

* c-ares: buffer overflow in config_sortlist() due to missing string length check (CVE-2022-4904)
* c-ares: Buffer Underwrite in ares_inet_net_pton() (CVE-2023-31130)
* c-ares: Insufficient randomness in generation of DNS query IDs (CVE-2023-31147)
* c-ares: AutoTools does not set CARES_RANDOM_FILE during cross compilation (CVE-2023-31124)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Fixed packages 2

ReleasePackageFixed in
AlmaLinux · 9 c-ares 1.19.1-1.el9
AlmaLinux · 9 c-ares-devel 1.19.1-1.el9

Vulnerabilities 4

  • High 8.6
    CVE-2022-4904

    A flaw was found in the c-ares package. The ares_set_sortlist is missing checks about the validity of the input string,…

    nodejs c-ares grpc c-ares Debian Ubuntu Azure Linux
  • Medium 5.9
    CVE-2023-31147

    Insufficient randomness in generation of DNS query IDs in c-ares

    c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable outp…

    c-ares c-ares nodejs nodejs18 Debian Azure Linux Wolfi
  • Medium 4.1
    CVE-2023-31130

    Buffer Underwrite in ares_inet_net_pton()

    c-ares is an asynchronous resolver library. ares_inet_net_pton() is 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 wh…

    c-ares c-ares nodejs nodejs18 Debian Ubuntu Azure Linux Wolfi
  • Low 3.7
    CVE-2023-31124

    AutoTools does not set CARES_RANDOM_FILE during cross compilation

    c-ares is an asynchronous resolver library. When cross-compiling c-ares and using the autotools build system, CARES_RANDOM_FILE will not be set, as seen when cross compiling aarch64 android. This will downgrade to using rand() as a fallback which could allow …

    c-ares c-ares c-ares c-ares Debian Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2022-4904
  • report
    https://access.redhat.com/security/cve/CVE-2023-31124
  • report
    https://access.redhat.com/security/cve/CVE-2023-31130
  • report
    https://access.redhat.com/security/cve/CVE-2023-31147
  • report
    https://bugzilla.redhat.com/2168631
  • report
    https://bugzilla.redhat.com/2209494
  • report
    https://bugzilla.redhat.com/2209497
  • report
    https://bugzilla.redhat.com/2209501
  • advisory
    https://errata.almalinux.org/9/ALSA-2023-6635.html