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    CVE-2024-25629

    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.

    Published:Feb 23, 2024
    Last Modified:Feb 13, 2025
    EPS:Feb 23, 2024
    EPSS Score:0.00035
    CVSS Score:4.4

    Affected Products

    Vendor
    C-ares
    Product
    C-ares
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-33630 (CVSS 7.5) — c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-…
    CVE-2025-62408 (CVSS 5.9) — c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum at…
    CVE-2020-22217 (CVSS 5.9) — Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_pa…
    CVE-2023-32067 (CVSS 7.5) — c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver se…
    CVE-2020-14354 (CVSS 3.3) — A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to ar…
    CVE-2017-1000381 (CVSS 7.5) — The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered …
    CVE-2016-5180 (CVSS 9.8) — Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attacke…

    References

    https://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183
    https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q
    https://lists.fedoraproject.org/archives/list/[email protected]/message/2P76QYINQNPEHUTEEDOUYIRZ2X6UVZ5K/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/CSCMTSPDIE2UHU34TIXQQHZ6JTE3Y3VF/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/GX37LFPFQ3T6FFMMFYQTEGIQXXN7F27U/
    https://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183
    https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q
    https://lists.fedoraproject.org/archives/list/[email protected]/message/2P76QYINQNPEHUTEEDOUYIRZ2X6UVZ5K/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/CSCMTSPDIE2UHU34TIXQQHZ6JTE3Y3VF/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/GX37LFPFQ3T6FFMMFYQTEGIQXXN7F27U/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High