Permissions, Privileges, and Access Controls in Linux kernel - CVE-2012-0056
Published: January 27, 2012 / Updated: November 20, 2020
Vulnerability identifier: #VU44356
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2012-0056
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The mem_write function in the Linux kernel before 3.2.2, when ASLR is disabled, does not properly check permissions when writing to /proc/<pid>/mem, which allows local users to gain privileges by modifying process memory, as demonstrated by Mempodipper.
Affected software
Linux kernel
How to mitigate CVE-2012-0056
Install update from vendor's website.
Links to Public Exploits and PoC-codes
External References
- http://blog.zx2c4.com/749
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e268337dfe26dfc7efd422a804dbb27977a3cccc
- http://secunia.com/advisories/47708
- http://ubuntu.com/usn/usn-1336-1
- http://www.kb.cert.org/vuls/id/470151
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2
- http://www.openwall.com/lists/oss-security/2012/01/18/1
- http://www.openwall.com/lists/oss-security/2012/01/18/2
- http://www.openwall.com/lists/oss-security/2012/01/19/4
- http://www.openwall.com/lists/oss-security/2012/01/22/4
- http://www.redhat.com/support/errata/RHSA-2012-0052.html
- http://www.redhat.com/support/errata/RHSA-2012-0061.html
- http://www.securityfocus.com/bid/51625
- https://bugzilla.redhat.com/show_bug.cgi?id=782642