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    CVE-2008-4109

    A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functions that are not async-signal-safe in the signal handler for login timeouts, which allows remote attackers to cause a denial of service (connection slot exhaustion) via multiple login attempts. NOTE: this issue exists because of an incorrect fix for CVE-2006-5051.

    Published:Sep 17, 2008
    Last Modified:Apr 23, 2026
    EPS:Sep 17, 2008
    EPSS Score:0.01427
    CVSS Score:5

    Affected Products

    Vendor
    Debian
    Product
    Linux
    Vendor
    Openbsd
    Product
    Openssh

    Exploits

    https://github.com/bigb0x/CVE-2024-6387

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678
    http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00004.html
    http://secunia.com/advisories/31885
    http://secunia.com/advisories/32080
    http://secunia.com/advisories/32181
    http://www.debian.org/security/2008/dsa-1638
    http://www.openwall.com/lists/oss-security/2024/07/01/3
    http://www.securitytracker.com/id?1020891
    http://www.ubuntu.com/usn/usn-649-1
    https://exchange.xforce.ibmcloud.com/vulnerabilities/45202
    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678
    http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00004.html
    http://secunia.com/advisories/31885
    http://secunia.com/advisories/32080
    http://secunia.com/advisories/32181
    http://www.debian.org/security/2008/dsa-1638
    http://www.openwall.com/lists/oss-security/2024/07/01/3
    http://www.securitytracker.com/id?1020891
    http://www.ubuntu.com/usn/usn-649-1
    https://exchange.xforce.ibmcloud.com/vulnerabilities/45202

    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