CVE-2011-0539

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    CVE-2011-0539

    Published: 10 Feb 2011Last Modified: 10 Apr 2026

    Summary:

    Details: The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.

    References: http://secunia.com/advisories/43181, http://secunia.com/advisories/44269, http://www.openssh.com/txt/legacy-cert.adv, http://www.vupen.com/english/advisories/2011/0284, http://www.openssh.com/txt/legacy-cert.adv, http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777, http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673, http://www.openwall.com/lists/oss-security/2011/02/04/2, http://www.securityfocus.com/bid/46155, http://www.securitytracker.com/id?1025028, https://exchange.xforce.ibmcloud.com/vulnerabilities/65163

    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