---------------------------------------------------------------------- Do you need accurate and reliable IDS / IPS / AV detection rules? Get in-depth vulnerability details: http://secunia.com/binary_analysis/sample_analysis/ ---------------------------------------------------------------------- TITLE: SSH Tectia Products CBC Mode Plaintext Recovery Vulnerability SECUNIA ADVISORY ID: SA32740 VERIFY ADVISORY: http://secunia.com/advisories/32740/ CRITICAL: Less critical IMPACT: Exposure of sensitive information WHERE: >From local network SOFTWARE: SSH Tectia Server for IBM z/OS 5.x http://secunia.com/advisories/product/12303/ SSH Tectia Server 5.x http://secunia.com/advisories/product/6528/ SSH Tectia Server 4.x http://secunia.com/advisories/product/3233/ SSH Tectia Client 5.x http://secunia.com/advisories/product/12301/ SSH Tectia Client 4.x http://secunia.com/advisories/product/3234/ SSH Tectia Client 6.x http://secunia.com/advisories/product/20505/ SSH Tectia Connector 4.x http://secunia.com/advisories/product/20508/ SSH Tectia Connector 5.x http://secunia.com/advisories/product/20509/ SSH Tectia ConnectSecure 6.x http://secunia.com/advisories/product/20507/ SSH Tectia Server 6.x http://secunia.com/advisories/product/20506/ SSH Tectia Server for IBM z/OS 6.x http://secunia.com/advisories/product/20510/ DESCRIPTION: A vulnerability has been reported in multiple SSH Tectia products, which potentially can be exploited by malicious people to disclose sensitive information. The vulnerability is caused due to an error when handling 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. The vulnerability affects the following products: * SSH Tectia Client, Server, and ConnectSecure 6.0.4 and older in the 6.x series * SSH Tectia Client, Server, and Connector 5.3.x versions 5.3.8 and prior * SSH Tectia Client, Server, and Connector 5.x versions 5.2.4 and prior * SSH Tectia Client, Server, and Connector 4.x versions 4.4.11 and prior * SSH Tectia Server for Linux on IBM System z 6.0.4 * SSH Tectia Server for IBM z/OS 6.0.1 and 6.0.0 * SSH Tectia Server for IBM z/OS 5.5.1 and prior * SSH Tectia Client 4.3.3-J (Japanese) and prior in the 4.x-J series * SSH Tectia Client 4.3.10-K (Korean) and prior in the 4.x-K series SOLUTION: Update to a fixed version. https://downloads.ssh.com/ SSH Tectia Client, Server, and ConnectSecure: Update to version 6.0.5. SSH Tectia Client, Server, and Connector 5.3.x: Update to version 5.3.9. SSH Tectia Client, Server, and Connector 5.x: Update to version 5.2.5. SSH Tectia Client, Server, and Connector 4.x: Update to version 4.4.12. SSH Tectia Server for Linux on IBM System z: Update to version 6.0.5. SSH Tectia Server for IBM z/OS 6.x: Update to version 6.0.2. SSH Tectia Server for IBM z/OS 5.x: Update to version 5.5.2. SSH Tectia Client 4.x (Japanese): Update to version 4.3.4-J. 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: SSH Communications Security: http://www.ssh.com/company/news/article/953/ Centre for the Protection of National Infrastructure (CPNI): http://www.cpni.gov.uk/Docs/Vulnerability_Advisory_SSH.txt ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------