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OpenSSH Signal Handling Vulnerability and User Enumeration Weakness Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA22173  
Release Date: 2006-09-29
Last Update: 2007-11-08

Critical:
Highly critical
Impact: Exposure of system information
DoS
System access
Where: From remote
Solution Status: Vendor Patch

Software:OpenSSH 3.x
OpenSSH 4.x

CVE reference:CVE-2006-5051 (Secunia mirror)
CVE-2006-5052 (Secunia mirror)

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Description:
A vulnerability and a weakness have been reported in OpenSSH, which can be exploited by malicious people to disclose certain system information, cause a DoS (Denial of Service), and potentially compromise a vulnerable system.

1) A race condition exists within the signal handling. This can be exploited to crash the OpenSSH server and potentially allows the execution of arbitrary code.

The vulnerability is reported in version 4.3. Prior versions may also be affected.

2) An error in the processing of GSSAPI authentication requests can be exploited to determine if a username is valid.

The weakness is reported in versions prior to 4.4.

Solution:
Update to OpenSSH 4.4.

Provided and/or discovered by:
1) Mark Dowd

Changelog:
2006-09-29: Added CVE reference.
2006-10-05: Added US-CERT reference.
2007-11-08: Updated "Description" section.

Original Advisory:
http://openssh.org/txt/release-4.4

Other References:
http://rhn.redhat.com/errata/RHSA-2006-0697.html

US-CERT VU#851340:
http://www.kb.cert.org/vuls/id/851340



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

12 Related Secunia Security Advisories, displaying 10

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4. OpenSSH Privilege Separation Monitor Weakness
5. OpenSSH Identical Blocks Denial of Service Vulnerability
6. OpenSSH scp Command Line Shell Command Injection
7. OpenSSH Two Security Issues
8. OpenSSH PAM implementation Vulnerability
9. OpenSSH "buffer_append_space()" Buffer Management Vulnerability
10. OpenSSH IP address restriction bypass

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