OpenSSH and multiple SSH Tectia products CBC mode information disclosure

openssh-sshtectia-cbc-info-disclosure (46620) The risk level is classified as LowLow Risk

Description:

OpenSSH and multiple SSH Tectia products could allow a remote attacker to obtain sensitive information, caused by the improper handling of errors within an SSH session which is encrypted with a block cipher algorithm in CBC mode. A remote attacker with read and write access to network data could exploit this vulnerability to display plaintext bits from a block of ciphertext and obtain sensitive information.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 3.2
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Obtain Information

Remedy:

For SSH Tectia Products:
Refer to SSH Company News, Article 953 for patch, upgrade or suggested workaround information. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • CPNI-957037: Plaintext Recovery Attack Against SSH .
  • HPSBMA02447 SSRT090062 rev.1: Insight Control Suite For Linux (ICE-LX) Cross Site Request Forgery (CSRF) , Remote Execution of Arbitrary Code, Denial of Service (DoS), and Other Vulnerabilities.
  • SSH Company News, Article 953: Plaintext Recovery Attack Against SSH.
  • SSH Web site: Customer Download Center.
  • Sun Alert ID: 247186: A Security Vulnerability in Solaris Secure Shell (SSH) May Expose Some Plain Text From Encrypted Traffic.
  • YAMAHA RT series router Web page: FAQ for YAMAHA RT Series / Security.
  • BID-32319: OpenSSH CBC Mode Information Disclosure Vulnerability
  • CVE-2008-5161: Error handling in the SSH protocol in (1) SSH Tectia Client and Server and Connector 4.0 through 4.4.11, 5.0 through 5.2.4, and 5.3 through 5.3.8; Client and Server and ConnectSecure 6.0 through 6.0.4; Server for Linux on IBM System z 6.0.4; Server for IBM z/OS 5.5.1 and earlier, 6.0.0, and 6.0.1; and Client 4.0-J through 4.3.3-J and 4.0-K through 4.3.10-K; and (2) OpenSSH 4.7p1 and possibly other versions, when using a block cipher algorithm in Cipher Block Chaining (CBC) mode, makes it easier for remote attackers to recover certain plaintext data from an arbitrary block of ciphertext in an SSH session via unknown vectors.
  • RHSA-2009-1287: Low: openssh security, bug fix, and enhancement update
  • SA32740: SSH Tectia Products CBC Mode Plaintext Recovery Vulnerability
  • SA32760: OpenSSH CBC Mode Plaintext Recovery Vulnerability
  • SA32833: Attachmate Products SSH CBC Mode Plaintext Recovery Vulnerability
  • SA33121: Sun Solaris SSH CBC Mode Plaintext Recovery Vulnerability
  • SA33308: Avaya CMS Solaris SSH CBC Mode Plaintext Recovery Vulnerability
  • SA34857: Yamaha RT Series Routers SSH CBC Mode Plaintext Recovery
  • SECTRACK ID: 1021235: OpenSSH CBC Mode Error Handling May Let Certain Remote Users Obtain Plain Text in Certain Cases
  • SECTRACK ID: 1021236: SSH Tectia CBC Mode Error Handling May Let Certain Remote Users Obtain Plain Text in Certain Cases
  • SECTRACK ID: 1021382: Solaris Secure Shell CBC Mode Error Handling May Let Certain Remote Users Obtain Plain Text in Certain Cases
  • US-CERT VU#958563: SSH CBC vulnerability
  • VUPEN/ADV-2008-3172: SSH Tectia Products CBC Mode Plaintext Recovery Vulnerability
  • VUPEN/ADV-2008-3173: OpenSSH Cipher-Block Chaining Mode Plaintext Recovery Vulnerability
  • VUPEN/ADV-2008-3409: Sun Solaris Secure Shell CBC Mode Plaintext Recovery Vulnerability
  • VUPEN/ADV-2009-1135: Yamaha RT Series Routers SSH CBC Mode Plaintext Recovery Issue
  • VUPEN/ADV-2009-3184: Apple Mac OS X Code Execution and Security Bypass Vulnerabilities

Platforms Affected:

  • HP Insight Control Suite For Linux 2.10 ICE-LX
  • OpenBSD OpenSSH 4.7p1
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5
  • SSH Tectia Client 4.4.11
  • SSH Tectia Client 5.0
  • SSH Tectia Client 5.1.0
  • SSH Tectia Client 5.2.0
  • SSH Tectia Client 5.2.1
  • SSH Tectia Client 5.2.2
  • SSH Tectia Client 5.2.3
  • SSH Tectia Client 5.2.4
  • SSH Tectia Client 5.3.0
  • SSH Tectia Client 5.3.1
  • SSH Tectia Client 5.3.2
  • SSH Tectia Client 5.3.3
  • SSH Tectia Client 5.3.4
  • SSH Tectia Client 5.3.5
  • SSH Tectia Client 5.3.8
  • SSH Tectia Client 6.0.4
  • SSH Tectia Connector 4.4.11
  • SSH Tectia Connector 5.0
  • SSH Tectia Connector 5.0.1
  • SSH Tectia Connector 5.0.2
  • SSH Tectia Connector 5.1.0
  • SSH Tectia Connector 5.2.4
  • SSH Tectia Connector 5.3.8
  • SSH Tectia Connector 6.0.4
  • SSH Tectia ConnectSecure 6.0.4
  • SSH Tectia Server 4.4.11
  • SSH Tectia Server 5.0
  • SSH Tectia Server 5.1.0
  • SSH Tectia Server 5.2.0
  • SSH Tectia Server 5.2.1
  • SSH Tectia Server 5.2.2
  • SSH Tectia Server 5.2.3
  • SSH Tectia Server 5.2.4
  • SSH Tectia Server 5.3.0
  • SSH Tectia Server 5.3.1
  • SSH Tectia Server 5.3.2
  • SSH Tectia Server 5.3.3
  • SSH Tectia Server 5.3.4
  • SSH Tectia Server 5.3.5
  • SSH Tectia Server 5.3.8
  • SSH Tectia Server 5.5.1
  • SSH Tectia Server 6.0.0
  • SSH Tectia Server 6.0.1
  • SSH Tectia Server 6.0.4
  • Sun OpenSolaris
  • Sun Solaris 10 SPARC
  • Sun Solaris 10 x86
  • Sun Solaris 9 SPARC
  • Sun Solaris 9 x86
  • Yamaha RT300i ja
  • Yamaha RT56v ja
  • Yamaha RT60w ja
  • Yamaha RT80i ja
  • Yamaha RTA50i ja
  • Yamaha RTA52i ja
  • Yamaha RTW65b ja
  • Yamaha RTX1000 ja
  • Yamaha RTX1500 ja
  • Yamaha RTX2000 ja
  • Yamaha YMS-VPN1 ja

Reported:

Nov 14, 2008

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