----------------------------------------------------------------------


Secure your corporate defenses and reduce complexity in handling vulnerability threats with the new Secunia Vulnerability Intelligence Manager (VIM).

Request a free trial: 
http://secunia.com/products/corporate/vim/


----------------------------------------------------------------------

TITLE:
OpenSSL "NETSCAPE_REUSE_CIPHER_CHANGE_BUG" Ciphersuite Downgrade
Vulnerability

SECUNIA ADVISORY ID:
SA42473

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42473/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42473

RELEASE DATE:
2010-12-03

DISCUSS ADVISORY:
http://secunia.com/advisories/42473/#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/42473/

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=42473

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 bypass certain security restrictions.

The vulnerability is caused due to an error within the
"SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG" workaround in the SSL/TLS
server code. This can be exploited by e.g. sniffing the session
identifier and downgrading the cached ciphersuite prior to the
legitimate client resuming the session, potentially leading to the
client using a weaker ciphersuite.

Successful exploitation requires that the server uses the internal
caching mechanisms of OpenSSL and the
"SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG" flag (e.g. enabled via the
"SSL_OP_ALL" option).

The vulnerability is reported in all versions prior to 0.9.8q or
1.0.0c.

SOLUTION:
Update to version 0.9.8q or 1.0.0c or apply patches.

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

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Martin Rex.

ORIGINAL ADVISORY:
http://www.openssl.org/news/secadv_20101202.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/

----------------------------------------------------------------------

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.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

----------------------------------------------------------------------