CVE-2011-2520 Deserialization in n/a

High 7.8 Published 21 Jul 2011 Updated 6 Aug 2024

Local attackers can gain privileges by exploiting unsafe pickle deserialization in the firewall configuration tool's D-Bus communication.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2011-2520?

CVE-2011-2520 is a high-severity unsafe deserialization vulnerability in Fedoraproject Fedora, published on 21 Jul 2011. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

fw_dbus.py in system-config-firewall 1.2.29 and earlier uses the pickle Python module unsafely during D-Bus communication between the GUI and the backend, which might allow local users to gain privileges via a crafted serialized object.

Weakness: CWE-502

Which versions are affected by CVE-2011-2520?

It affects 2 products.

Linux distribution packages (7)

`system-config-firewall` Red Hat:enterprise_linux:6::server	All versions	`0:1.2.27-3.el6_1.3`
`system-config-firewall-base` Red Hat:enterprise_linux:6::server	All versions	`0:1.2.27-3.el6_1.3`
`system-config-firewall-tui` Red Hat:enterprise_linux:6::server	All versions	`0:1.2.27-3.el6_1.3`
`system-config-printer` Red Hat:enterprise_linux:6::server	All versions	`0:1.1.16-17.el6_1.2`
`system-config-printer-debuginfo` Red Hat:enterprise_linux:6::server	All versions	`0:1.1.16-17.el6_1.2`
`system-config-printer-libs` Red Hat:enterprise_linux:6::server	All versions	`0:1.1.16-17.el6_1.2`
`system-config-printer-udev` Red Hat:enterprise_linux:6::server	All versions	`0:1.1.16-17.el6_1.2`

Products include Fedoraproject Fedora, Redhat System-Config-Firewall.

How do I fix CVE-2011-2520?

Apply the vendor's patch.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2011-2520 being exploited?

There is no known exploitation of CVE-2011-2520 in the wild and no public exploit code.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as GHSA-j359-qhq6-r897, RHSA-2011:0953.