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TITLE:
OpenSSL ClientHello Handshake Message Parsing Vulnerability

SECUNIA ADVISORY ID:
SA43227

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43227/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43227

RELEASE DATE:
2011-02-11

DISCUSS ADVISORY:
http://secunia.com/advisories/43227/#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/43227/

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=43227

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 disclose potentially sensitive information or
cause a DoS (Denial of Service).

The vulnerability is caused due to an error when parsing certain
malformed ClientHello handshake messages, which can be exploited to
e.g. trigger an invalid memory access by sending specially crafted
ClientHello handshake messages to the server. Depending upon the
application, this may also lead to the disclosure of e.g. contents of
parsed OCSP (Online Certificate Status Protocol) extensions.

Note: This only affects servers using the
"SSL_CTX_set_tlsext_status_cb()" function on their SSL_CTX (e.g.
Apache httpd version 2.3.3 or later).

The vulnerability is reported in versions 0.9.8h through 0.9.8q and
1.0.0 through 1.0.0c.

SOLUTION:
Update to version 0.9.8r or 1.0.0d or apply the patch.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Neel Mehta, Google.

ORIGINAL ADVISORY:
http://www.openssl.org/news/secadv_20110208.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:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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