CVE-2012-4559

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    CVE-2012-4559

    Published: 30 Nov 2012Last Modified: 10 Apr 2026

    Summary:

    Details: Multiple double free vulnerabilities in the (1) agent_sign_data function in agent.c, (2) channel_request function in channels.c, (3) ssh_userauth_pubkey function in auth.c, (4) sftp_parse_attr_3 function in sftp.c, and (5) try_publickey_from_file function in keyfiles.c in libssh before 0.5.3 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.

    References: http://www.debian.org/security/2012/dsa-2577, http://www.libssh.org/2012/11/20/libssh-0-5-3-security-release/, http://www.mandriva.com/security/advisories?name=MDVSA-2012:175, http://www.ubuntu.com/usn/USN-1640-1, https://bugzilla.redhat.com/show_bug.cgi?id=871612, http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093313.html, http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093474.html, http://lists.opensuse.org/opensuse-security-announce/2012-12/msg00002.html, http://lists.opensuse.org/opensuse-updates/2012-12/msg00016.html, http://lists.opensuse.org/opensuse-updates/2013-01/msg00021.html, http://www.openwall.com/lists/oss-security/2012/11/20/3, http://www.securityfocus.com/bid/56604, https://exchange.xforce.ibmcloud.com/vulnerabilities/80218

    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