CVE-2013-4566 Auth bypass in n/a

Medium 4.0 Published 12 Dec 2013 Updated 6 Aug 2024

Remote attackers can bypass intended access restrictions in mod_nss when server-level client verification is disabled but directory-level verification is enabled.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2013-4566?

CVE-2013-4566 is a medium-severity authentication bypass vulnerability in Redhat Enterprise Linux, published on 12 Dec 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.

Weakness: CWE-264

Which versions are affected by CVE-2013-4566?

It affects 2 products.

Linux distribution packages (12)

`mod_nss` Red Hat:enterprise_linux:5::client	All versions	`0:1.0.8-8.el5_10`
`mod_nss-debuginfo` Red Hat:enterprise_linux:5::client	All versions	`0:1.0.8-8.el5_10`
`mod_nss` Red Hat:enterprise_linux:5::server	All versions	`0:1.0.8-8.el5_10`
`mod_nss-debuginfo` Red Hat:enterprise_linux:5::server	All versions	`0:1.0.8-8.el5_10`
`mod_nss` Red Hat:enterprise_linux:6::client	All versions	`0:1.0.8-19.el6_5`
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::client	All versions	`0:1.0.8-19.el6_5`
`mod_nss` Red Hat:enterprise_linux:6::computenode	All versions	`0:1.0.8-19.el6_5`
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::computenode	All versions	`0:1.0.8-19.el6_5`
`mod_nss` Red Hat:enterprise_linux:6::server	All versions	`0:1.0.8-19.el6_5`
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::server	All versions	`0:1.0.8-19.el6_5`
`mod_nss` Red Hat:enterprise_linux:6::workstation	All versions	`0:1.0.8-19.el6_5`
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::workstation	All versions	`0:1.0.8-19.el6_5`

Products include Mod Nss Project Mod Nss, Redhat Enterprise Linux.

How do I fix CVE-2013-4566?

Apply the vendor's patch.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2013-4566 being exploited?

There is no known exploitation of CVE-2013-4566 in the wild and no public exploit code.

All Redhat Enterprise Linux vulnerabilities

Sources

Also known as GHSA-c4hv-94wj-93p7, MGASA-2013-0381, RHSA-2013:1779, SUSE-RU-2015:0591-1, UBUNTU-CVE-2013-4566.