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lighttpd OpenSSL Error Queue Denial of Service Vulnerability

Secunia Advisory: SA29544  
Release Date: 2008-04-02

Critical:
Moderately critical
Impact: DoS
Where: From remote
Solution Status: Vendor Workaround

Software:lighttpd 1.x

CVE reference:CVE-2008-1531 (Secunia mirror)



Description:
A vulnerability has been reported in lighttpd, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to lighttpd not properly clearing the OpenSSL error queue. This can be exploited to close concurrent SSL connections of lighttpd by terminating one SSL connection.

The vulnerability is reported in version 1.4.19. Other versions may also be affected.

Solution:
Fixed in the SVN repository.
http://trac.lighttpd.net/trac/changeset/2136
http://trac.lighttpd.net/trac/changeset/2139

Provided and/or discovered by:
Discussed in the lighttpd bug #285. Additional research provided by marton.illes.
http://trac.lighttpd.net/trac/ticket/285

Original Advisory:
http://trac.lighttpd.net/trac/ticket/285



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.

8 Related Secunia Security Advisories

1. lighttpd mod_cgi and mod_userdir Information Disclosure Security Issues
2. lighttpd File Descriptor Array Denial of Service Vulnerability
3. lighttpd mod_fastcgi PHP Header Overflow
4. lighttpd Multiple Vulnerabilities
5. lighttpd "mtime" and "\r\n\r\n\" Denial of Service Vulnerabilities
6. Lighttpd Script Source Disclosure Vulnerability
7. Lighttpd Case-Insensitive Filename Source Code Disclosure
8. lighttpd "%00" Application Source Code Disclosure Vulnerability


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