CVE-2023-31124
First published: Wed May 24 2023(Updated: )
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 an attacker to take advantage of the lack of entropy by not using a CSPRNG. This issue was patched in version 1.19.1.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| C-ares Project C-ares | <1.19.1 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 |
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Reference Links
- https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
- https://github.com/c-ares/c-ares/security/advisories/GHSA-54xr-f67r-4pc4
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
- https://security.gentoo.org/glsa/202310-09
- https://access.redhat.com/security/cve/CVE-2023-31124
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209542
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209543
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209539
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209544
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209545
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209546
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209540
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209541
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209547
- https://access.redhat.com/errata/RHSA-2023:3577
- https://access.redhat.com/errata/RHSA-2023:3586
- https://access.redhat.com/errata/RHSA-2023:4036
- https://access.redhat.com/errata/RHSA-2023:4039
- https://access.redhat.com/errata/RHSA-2023:4035
- https://access.redhat.com/errata/RHSA-2023:4034
- https://access.redhat.com/errata/RHSA-2023:4033
- https://access.redhat.com/errata/RHSA-2023:6635
- https://bugzilla.redhat.com/show_bug.cgi?id=2209494
Frequently Asked Questions
What is CVE-2023-31124?
CVE-2023-31124 is a vulnerability in the c-ares asynchronous resolver library that downgrades to using rand() as a fallback, allowing an attacker to take advantage of the lack of randomness in cryptographic keys.
What is the severity of CVE-2023-31124?
CVE-2023-31124 has a severity level of medium, with a CVSS score of 6.5.
What software versions are affected by CVE-2023-31124?
Versions up to and excluding 1.19.1 of the c-ares library and Fedora versions 37 and 38 are affected by CVE-2023-31124.
How can an attacker exploit CVE-2023-31124?
An attacker can exploit CVE-2023-31124 by taking advantage of the lack of randomness in cryptographic keys generated by the fallback rand() function.
Where can I find more information about CVE-2023-31124?
You can find more information about CVE-2023-31124 at the following references: [Red Hat Security Advisory](https://access.redhat.com/security/cve/CVE-2023-31124), [GitHub Security Advisory](https://github.com/c-ares/c-ares/security/advisories/GHSA-54xr-f67r-4pc4), [Bugzilla](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209542).
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