CVE-2011-2520

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

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• http://lists.fedoraproject.org/pipermail/package-announce/2011-August/063314.html
• http://secunia.com/advisories/45294
• http://securitytracker.com/id?1025793
• http://www.openwall.com/lists/oss-security/2011/07/18/6
• http://www.redhat.com/support/errata/RHSA-2011-0953.html
• http://www.securityfocus.com/bid/48715
• https://bugzilla.redhat.com/show_bug.cgi?id=717985
• https://exchange.xforce.ibmcloud.com/vulnerabilities/68734
• http://lists.fedoraproject.org/pipermail/package-announce/2011-August/063314.html
• http://secunia.com/advisories/45294
• http://securitytracker.com/id?1025793
• http://www.openwall.com/lists/oss-security/2011/07/18/6
• http://www.redhat.com/support/errata/RHSA-2011-0953.html
• http://www.securityfocus.com/bid/48715
• https://bugzilla.redhat.com/show_bug.cgi?id=717985
• https://exchange.xforce.ibmcloud.com/vulnerabilities/68734