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TITLE:
lighttpd OpenSSL Error Queue Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA29544

VERIFY ADVISORY:
http://secunia.com/advisories/29544/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
lighttpd 1.x
http://secunia.com/product/4661/

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

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About:
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