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    CVE-2023-31147

    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 output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.

    Published:May 22, 2023
    Last Modified:Feb 13, 2025
    EPS:May 25, 2023
    EPSS Score:0.00087
    CVSS Score:5.9

    Affected Products

    Vendor
    C-ares Project
    Product
    C-ares
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Software Collections

    Exploits

    No exploit reference

    Related CVEs

    CVE-2023-31124 (CVSS 3.7) — c-ares is an asynchronous resolver library. When cross-compiling c-ares and using the autotools build system, …
    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-2023-31130 (CVSS 4.1) — c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certa…
    CVE-2022-4904 (CVSS 8.6) — A flaw was found in the c-ares package. The ares_set_sortlist is missing checks about the validity of the inpu…
    CVE-2021-3672 (CVSS 5.6) — A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Doma…
    CVE-2020-8277 (CVSS 7.5) — A Node.js application that allows an attacker to trigger a DNS request for a host of their choice could trigge…
    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…

    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