CVE-2008-4109

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 28.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2008-09-18 · updated 2026-06-16
Weakness: CWE-264

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.

Affected products

OpenSSH: through 4.3p2; through 4.6; 1.2, 1.2.1, 1.2.2, 1.2.3, 1.2.27, 1.3 (+60)

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

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