CVE-2015-5400

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    CVE-2015-5400

    Published: 28 Sept 2015Last Modified: 16 Apr 2026

    Summary:

    Details: Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended restrictions and gain access to a backend proxy via a CONNECT request.

    References: http://www.debian.org/security/2015/dsa-3327, http://www.squid-cache.org/Advisories/SQUID-2015_2.txt, http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch, http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch, http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch, http://www.openwall.com/lists/oss-security/2015/07/17/14, http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch, http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch, http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch, http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183598.html, http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html, http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html, http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html, http://www.openwall.com/lists/oss-security/2015/07/06/8, http://www.openwall.com/lists/oss-security/2015/07/09/12, http://www.openwall.com/lists/oss-security/2015/07/10/2, http://www.securityfocus.com/bid/75553, http://www.securitytracker.com/id/1032873

    Affected packages

    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