CVE-2013-4207

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    CVE-2013-4207

    Published: 19 Aug 2013Last Modified: 16 Apr 2026

    Summary:

    Details: Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206.

    References: http://secunia.com/advisories/54379, http://secunia.com/advisories/54533, http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html, http://www.debian.org/security/2013/dsa-2736, http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html, http://www.openwall.com/lists/oss-security/2013/08/06/11

    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