PolarSSL Diffie Hellman Key Exchange Security Bypass Vulnerability

Bugtraq ID:	46670
Class:	Design Error
CVE:	CVE-2011-1923
Remote:	Yes
Local:	No
Published:	Mar 03 2011 12:00AM
Updated:	Oct 17 2013 10:45AM
Credit:	Larry Highsmith, Subreption LLC
Vulnerable:	Offspark PolarSSL 0.99-pre1 0 Offspark PolarSSL 0.14 Gentoo Linux
Not Vulnerable:	Offspark PolarSSL 0.99-pre3 0 Offspark PolarSSL 0.14.2

PolarSSL Diffie Hellman Key Exchange Security Bypass Vulnerability

PolarSSL is prone to a security-bypass vulnerability.

Successfully exploiting this issue allows attackers to perform man-in-the-middle attacks or impersonate trusted servers, which will aid in further attacks.

NOTE: Successful exploitation requires full authentication to be disabled for the following cipher suites:

1) SSL_EDH_RSA_DES_168_SHA
2) SSL_EDH_RSA_AES_128_SHA
3) SSL_EDH_RSA_AES_256_SHA
4) SSL_EDH_RSA_CAMELLIA_128_SHA
5) SSL_EDH_RSA_CAMELLIA_256_SHA

PolarSSL versions prior to 0.14.1 and 0.99-pre1 are vulnerable.

PolarSSL Diffie Hellman Key Exchange Security Bypass Vulnerability

Currently, we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

PolarSSL Diffie Hellman Key Exchange Security Bypass Vulnerability

Solution:
Updates are available. Please see the references for more information.

PolarSSL Diffie Hellman Key Exchange Security Bypass Vulnerability

References:

• PolarSSL Security Advisory 2011-01 (PolarSSL)
  
• Vendor Homepage (PolarSSL)