National Cyber-Alert System
Vulnerability Summary for CVE-2008-4109
Original release date:09/18/2008
Last revised:02/12/2009
Source:
US-CERT/NIST
Overview
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.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
2.9
Exploitability Subscore:
10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
- Official Statement from Red Hat (01/01/1900)
-
Not vulnerable. The patch used to fix CVE-2006-5051 in Red Hat Enterprise Linux 2.1, 3, 4, and 5 was complete and does not suffer from this problem.
References to Advisories, Solutions, and Tools
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External Source: DEBIAN
Name: DSA-1638
Type: Patch Information
External Source: XF
Name: openssh-signalhandler-dos(45202)
External Source: UBUNTU
Name: USN-649-1
External Source: SECTRACK
Name: 1020891
External Source: SECUNIA
Name: 32181
External Source: SECUNIA
Name: 32080
External Source: SECUNIA
Name: 31885
External Source: SUSE
Name: SUSE-SR:2008:020
External Source: CONFIRM
Name: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678