CVE-2004-1440

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    CVE-2004-1440

    Published: 31 Dec 2004Last Modified: 10 Apr 2026

    Summary:

    Details: Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow (1) remote attackers to execute arbitrary code via an SSH2 packet with a base argument that is larger than the mod argument, which causes the modpow function to write memory before the beginning of its buffer, and (2) remote malicious servers to cause a denial of service (client crash) and possibly execute arbitrary code via a large bignum during authentication.

    References: http://secunia.com/advisories/12212/, http://www.gentoo.org/security/en/glsa/glsa-200408-04.xml, http://www.securityfocus.com/bid/10850, http://marc.info/?l=bugtraq&m=109167869528138&w=2, http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html, http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modpow.html, https://exchange.xforce.ibmcloud.com/vulnerabilities/16885

    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