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TITLE:
PolarSSL Diffie-Hellman Key Exchange Vulnerability

SECUNIA ADVISORY ID:
SA43595

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43595/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43595

RELEASE DATE:
2011-03-03

DISCUSS ADVISORY:
http://secunia.com/advisories/43595/#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/43595/

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=43595

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 PolarSSL, which can be exploited
by malicious people to disclose sensitive information or manipulate
certain data.

The vulnerability is caused due to PolarSSL not properly rejecting
certain weak keys used in a Diffie-Hellman key exchange, which can be
exploited to force the generation of a predictable secret by modifying
the parameters during the handshake via a Man-in-the-Middle (MitM)
attack.

Successful exploitation requires that the SSL_EDH_RSA_DES_168_SHA,
SSL_EDH_RSA_AES_128_SHA, SSL_EDH_RSA_AES_256_SHA,
SSL_EDH_RSA_CAMELLIA_128_SHA, or SSL_EDH_RSA_CAMELLIA_256_SHA cipher
suites are used without full authentication.

SOLUTION:
Update to versions 0.99-pre3 and 0.14.2 or apply the patch.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Larry Highsmith, Subreption LLC

ORIGINAL ADVISORY:
http://polarssl.org/trac/wiki/SecurityAdvisory201101

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.

Subscribe:
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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.

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