OpenSSH < 6.9 Multiple Vulnerabilities
High Nessus Plugin ID 84638
SynopsisThe SSH server running on the remote host is affected by multiple vulnerabilities.
DescriptionAccording to its banner, the version of OpenSSH running on the remote host is prior to 6.9. It is, therefore, affected by the following vulnerabilities :
- A flaw exists within the x11_open_helper() function in the 'channels.c' file that allows connections to be permitted after 'ForwardX11Timeout' has expired. A remote attacker can exploit this to bypass timeout checks and XSECURITY restrictions. (CVE-2015-5352)
- Various issues were addressed by fixing the weakness in agent locking by increasing the failure delay, storing the salted hash of the password, and using a timing-safe comparison function.
- An out-of-bounds read error exists when handling incorrect pattern lengths. A remote attacker can exploit this to cause a denial of service or disclose sensitive information in the memory.
- An out-of-bounds read error exists when parsing the 'EscapeChar' configuration option.
SolutionUpgrade to OpenSSH 6.9 or later.