Portable OpenSSH ssh-keysign ssh-rand-helper Utility File Descriptor Leak Local Information Disclosure

low Nessus Plugin ID 53841
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Synopsis

Local attackers may be able to access sensitive information.

Description

According to its banner, the version of OpenSSH running on the remote host is earlier than 5.8p2. Such versions may be affected by a local information disclosure vulnerability that could allow the contents of the host's private key to be accessible by locally tracing the execution of the ssh-keysign utility. Having the host's private key may allow the impersonation of the host.

Note that installations are only vulnerable if ssh-rand-helper was enabled during the build process, which is not the case for *BSD, OS X, Cygwin and Linux.

Solution

Upgrade to Portable OpenSSH 5.8p2 or later.

See Also

http://www.openssh.com/txt/portable-keysign-rand-helper.adv

http://www.openssh.com/txt/release-5.8p2

Plugin Details

Severity: Low

ID: 53841

File Name: openssh_58p2.nasl

Version: 1.6

Type: remote

Family: Misc.

Published: 5/9/2011

Updated: 7/16/2018

Dependencies: ssh_detect.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Exploit Ease: No known exploits are available

Patch Publication Date: 5/3/2011

Vulnerability Publication Date: 5/3/2011

Reference Information

CVE: CVE-2011-4327

BID: 47691

Secunia: 44347