National Cyber Awareness System

Vulnerability Summary for CVE-2008-4109

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):

CVSS Version 2 Metrics:

Vendor Statements (disclaimer)

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

Hyperlink:http://www.debian.org/security/2008/dsa-1638

External Source: XF

Name: openssh-signalhandler-dos(45202)

Hyperlink:http://xforce.iss.net/xforce/xfdb/45202

External Source: UBUNTU

Name: USN-649-1

Hyperlink:http://www.ubuntu.com/usn/usn-649-1

External Source: SECTRACK

Name: 1020891

Hyperlink:http://www.securitytracker.com/id?1020891

External Source: SECUNIA

Name: 32181

Hyperlink:http://secunia.com/advisories/32181

External Source: SECUNIA

Name: 32080

Hyperlink:http://secunia.com/advisories/32080

External Source: SECUNIA

Name: 31885

Hyperlink:http://secunia.com/advisories/31885

External Source: SUSE

Name: SUSE-SR:2008:020

Hyperlink:http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00004.html

External Source: CONFIRM

Name: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678

Hyperlink:http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678