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TITLE:
OpenSSL TLS Server Extension Parsing Race Condition Vulnerability

SECUNIA ADVISORY ID:
SA42243

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42243/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42243

RELEASE DATE:
2010-11-16

DISCUSS ADVISORY:
http://secunia.com/advisories/42243/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/42243/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=42243

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in OpenSSL, which can be exploited
by malicious people to cause a DoS (Denial of Service) and
potentially compromise an application using the library.

The vulnerability is caused due to a race condition within the TLS
extension parsing code, which can be exploited to cause a heap-based
buffer overflow.

Successful exploitation requires that the server is multi-threaded
and uses the internal caching mechanism of OpenSSL. Multi-processed
servers or servers with disabled internal caching session (e.g.
Apache HTTP server, Stunnel) are not affected.

The vulnerability is reported in versions 0.9.8f through 0.9.8o and
versions 1.0.0 and 1.0.0a.

SOLUTION:
Update to version 0.9.8p and 1.0.0b or apply patches.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Rob Hulswit.

ORIGINAL ADVISORY:
http://www.openssl.org/news/secadv_20101116.txt

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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private users keeping their systems up to date against the latest
vulnerabilities.

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