CVE-2013-2851

Format string vulnerability in the register_disk function in block/genhd.c in the Linux kernel through 3.9.4 allows local users to gain privileges by leveraging root access and writing format string specifiers to /sys/module/md_mod/parameters/new_array in order to create a crafted /dev/md device name.

Weakness

The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

Affected Software

Extended Description

When an attacker can modify an externally-controlled format string, this can lead to buffer overflows, denial of service, or data representation problems. It should be noted that in some circumstances, such as internationalization, the set of format strings is externally controlled by design. If the source of these format strings is trusted (e.g. only contained in library files that are only modifiable by the system administrator), then the external control might not itself pose a vulnerability.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/135.html
• https://cwe.mitre.org/data/definitions/67.html

References

• http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00003.html
• http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00004.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00129.html
• http://marc.info/?l=linux-kernel\u0026m=137055204522556\u0026w=2
• http://rhn.redhat.com/errata/RHSA-2013-1645.html
• http://rhn.redhat.com/errata/RHSA-2013-1783.html
• http://rhn.redhat.com/errata/RHSA-2014-0284.html
• http://www.debian.org/security/2013/dsa-2766
• http://www.openwall.com/lists/oss-security/2013/06/06/13
• http://www.ubuntu.com/usn/USN-1912-1
• http://www.ubuntu.com/usn/USN-1913-1
• http://www.ubuntu.com/usn/USN-1941-1
• http://www.ubuntu.com/usn/USN-1942-1
• https://bugzilla.redhat.com/show_bug.cgi?id=969515