Vulnerability CVE-2011-4362
Published: 2011-12-24   Modified: 2012-02-13

Description:
Integer signedness error in the base64_decode function in the HTTP authentication functionality (http_auth.c) in lighttpd 1.4 before 1.4.30 and 1.5 before SVN revision 2806 allows remote attackers to cause a denial of service (segmentation fault) via crafted base64 input that triggers an out-of-bounds read with a negative index.

See advisories in our WLB2 database:
Topic
Author
Date
High
Lighttpd 1.5.0 Proof of Concept
Adam Zabrocki
02.01.2012

Type:

CWE-189

 (Numeric Errors)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Lighttpd -> Lighttpd 
Debian -> Debian linux 

 References:
http://archives.neohapsis.com/archives/bugtraq/2011-12/0167.html
http://blog.pi3.com.pl/?p=277
http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt
http://redmine.lighttpd.net/issues/2370
http://www.debian.org/security/2011/dsa-2368
http://www.exploit-db.com/exploits/18295
http://www.openwall.com/lists/oss-security/2011/11/29/13
http://www.openwall.com/lists/oss-security/2011/11/29/8
http://www.securitytracker.com/id?1026359
https://bugzilla.redhat.com/show_bug.cgi?id=758624
https://exchange.xforce.ibmcloud.com/vulnerabilities/71536
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