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Vulnerability record · CVE-2008-4109 · published 18 September 2008

CVE-2008-4109: Openbsd openssh permissions and access controls vulnerability

Openbsd · Openssh

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.

5.0 CVSS 2.0 Medium EPSS 28% · top 1.9% CWE-264 · Permissions and access controls
5.0CVSS 2.0 base score
28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 Patch
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 Patch
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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2008-4109), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.