openssh-server Forced Command Handling Information Disclosure Vulnerability on blog.greenhouse.io

How it was found

Summary of the issue:

The auth_parse_options function in auth-options.c in sshd in OpenSSH before 5.7 provides debug messages containing

authorized_keys command options, which allows remote authenticated users to obtain potentially sensitive information

by reading these messages, as demonstrated by the shared user account required by Gitolite. NOTE: this can cross

privilege boundaries because a user account may intentionally have no shell or filesystem access, and therefore may

have no supported way to read an authorized_keys file in its own home directory.

OpenSSH before 5.7 is affected.

Attack details..:

According to its banner, the version of OpenSSH installed on the remote

host is older than 5.7:

ssh-2.0-openssh_5.5p1 debian-6+squeeze5

Summary:

The auth_parse_options function in auth-options.c in sshd in OpenSSH before 5.7

provides debug messages containing authorized_keys command options, which allows

remote authenticated users to obtain potentially sensitive information by

reading these messages, as demonstrated by the shared user account required by

Gitolite. NOTE: this can cross privilege boundaries because a user account may

intentionally have no shell or filesystem access, and therefore may have no

supported way to read an authorized_keys file in its own home directory.

OpenSSH before 5.7 is affected;

Solution/Fix: Updates are available.

References: CVE: CVE-2012-0814 (http://www.securityfocus.com/bid/51702, etc..)

Br,

Simone