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CVE-2024-25629 Details

Description

c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIASES` file, and if using a c-ares version prior to 1.27.0, the `/etc/hosts` file. If any of these configuration files has an embedded `NULL` character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:4.4 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183	CVE	Patch
https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q	CVE	Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/2P76QYINQNPEHUTEEDOUYIRZ2X6UVZ5K/	CVE	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/CSCMTSPDIE2UHU34TIXQQHZ6JTE3Y3VF/	CVE	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/GX37LFPFQ3T6FFMMFYQTEGIQXXN7F27U/	CVE	Mailing List
https://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183	[email protected]	Patch
https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q	[email protected]	Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/2P76QYINQNPEHUTEEDOUYIRZ2X6UVZ5K/	[email protected]	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/CSCMTSPDIE2UHU34TIXQQHZ6JTE3Y3VF/	[email protected]	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/GX37LFPFQ3T6FFMMFYQTEGIQXXN7F27U/	[email protected]	Mailing List

see all 10 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	[email protected]
CWE-127	Buffer Under-read	[email protected]

Affected Products

Product	Versions
c-ares c-ares	< 1.27.0
CPE cpe:2.3:a:c-ares:c-ares:::::::: Remediation No remediation found in references.
fedoraproject fedora	38 39 40
CPE cpe:2.3:o:fedoraproject:fedora:38:::::::* cpe:2.3:o:fedoraproject:fedora:39:::::::* cpe:2.3:o:fedoraproject:fedora:40:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Feb 5, 2025	Initial Analysis	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Apr 19, 2024	CVE Modified	[email protected]
Apr 16, 2024	CVE Modified	[email protected]
Feb 23, 2024	New CVE Received	[email protected]