---------------------------------------------------------------------- Do you need accurate and reliable IDS / IPS / AV detection rules? Get in-depth vulnerability details: http://secunia.com/binary_analysis/sample_analysis/ ---------------------------------------------------------------------- TITLE: OpenSSH CBC Mode Plaintext Recovery Vulnerability SECUNIA ADVISORY ID: SA32760 VERIFY ADVISORY: http://secunia.com/advisories/32760/ CRITICAL: Less critical IMPACT: Exposure of sensitive information WHERE: >From local network SOFTWARE: OpenSSH 4.x http://secunia.com/advisories/product/5653/ DESCRIPTION: A vulnerability has been reported in OpenSSH, which potentially can be exploited by malicious people to disclose sensitive information. The vulnerability is caused due to the improper handling of errors within an SSH session encrypted with a block cipher algorithm in the CBC (Cipher-Block Chaining) mode. This can be exploited to potentially disclose up to 32 plaintext bits from an arbitrary block of ciphertext. NOTE: An attack has a low probability of success, an attempt resulting in the termination of the current SSH session. Successful exploitation requires that an attacker is able to read and alter network data. This is related to: SA32740 The vulnerability is reported in version 4.7p1. Other versions may also be affected. SOLUTION: Allow only CTR (Counter) mode cipher algorithms (e.g. AES-CTR) to be used in an SSH session. PROVIDED AND/OR DISCOVERED BY: Martin Albrecht, Kenny Paterson, and Gaven Watson from the Information Security Group at Royal Holloway, University of London, reported via CPNI ORIGINAL ADVISORY: Centre for the Protection of National Infrastructure (CPNI): http://www.cpni.gov.uk/Docs/Vulnerability_Advisory_SSH.txt OTHER REFERENCES: SA32740: http://secunia.com/advisories/32740/ ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody 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 ----------------------------------------------------------------------