Security Advisory SA47401 - FreeBSD pam_ssh Unencrypted Private Key Security Issue

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Secunia Advisory SA47401

FreeBSD pam_ssh Unencrypted Private Key Security Issue

Secunia Advisory

SA47401

Release Date

2011-12-26

Popularity

819 views

Comments

0 comments

Criticality level

Moderately critical

Impact

Security Bypass

Where

From remote

Authentication level

This information is available to Secunia VIM customers

Report reliability

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Solution Status

Vendor Patch

Systems affected

This information is available to Secunia VIM customers

Approve distribution

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Remediation status

Secunia CSI, Secunia PSI

Automated scanning

Secunia CSI, Secunia PSI

Operating System

FreeBSD 7.3

FreeBSD 8.1

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

No CVE references.

Description

A security issue has been reported in FreeBSD, which can be exploited by malicious people to bypass certain security restrictions.

The security issue is caused due to the pam_ssh module not verifying the passphrase when authenticating users with unencrypted SSH private keys. This can be exploited to login to a user's account by providing an arbitrary passphrase.

Solution
Update FreeBSD or apply the patch.

Provided and/or discovered by
Guy Helmer, Dag-Erling Smorgrav in a bug report.

Original Advisory
FreeBSD-SA-11:09:
http://security.freebsd.org/advisories/FreeBSD-SA-11:09.pam_ssh.asc

Guy Helmer:
http://osdir.com/ml/freebsd-security/2011-11/msg00000.html

Deep Links
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Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: FreeBSD pam_ssh Unencrypted Private Key Security Issue

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Secunia Advisory SA47401

FreeBSD pam_ssh Unencrypted Private Key Security Issue

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