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Home - AdvisoriesPrint
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CERT-In Advisory CIAD-2007-0053

OpenSSL SSL_get_shared_ciphers Function and DTLS Implementation Vulnerability

Original Issue Date: October 19, 2007

Severity Rating: High

Systems Affected

  • All releases of 0.9.8 prior to 0.9.8f.
  • All releases of 0.9.7 prior to 0.9.7m.  

Overview

Two vulnerabilities have been reported in OpenSSL which could be exploited by remote attacker to execute arbitrary code on the affected system.

Description

1. Off-by-one error in SSL_get_shared_ciphers function ( CVE-2007-5135   )

A vulnerability has been reported in OpenSSL due to off-by-one error in SSL_get_shared_ciphers function. This could be exploited by remote attacker by sending crafted packet to trigger one byte buffer underflow and execute arbitrary code on the affected system.

2. OpenSSL DTLS Implementation Vulnerability ( CVE-2007-4995   )

DTLS is a datagram variant of TLS Transport Layer Security protocol. A vulnerability has been reported in OpenSSL within the DTLS implementation due to off-by-one error. This could be exploited by remote attacker to execute arbitrary code via unspecified vectors. It is to be noted that the vulnerabilities do not affect SSL and TLS so only clients and servers explicitly using DTLS are affected. 



Solution

  • Upgrade to latest version of OpenSSL 0.9.8f
  • Upgrade to the latest version of OpenSSL 0.9.8f and rebuild all packages using OpenSSL for DTLS
 

Workaround

  • Don't use SSL_get_shared_ciphers
  • Disable DTLS

Vendor Information

OpenSSL
http://www.openssl.org/news/secadv_20071012.txt

References

SecurityFocus
http://www.securityfocus.com/bid/26055

Secunia
http://secunia.com/advisories/25878

CVE Name
CVE-2007-5135
CVE-2007-4995

CWE Name
CWE-189

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-24368572

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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