SB2014022805 - Input validation error in Linux kernel
Published: February 28, 2014 Updated: August 10, 2020
Security Bulletin ID
SB2014022805
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2014-2038)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The nfs_can_extend_write function in fs/nfs/write.c in the Linux kernel before 3.13.3 relies on a write delegation to extend a write operation without a certain up-to-date verification, which allows local users to obtain sensitive information from kernel memory in opportunistic circumstances by writing to a file in an NFS filesystem and then reading the same file.
Remediation
Install update from vendor's website.
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=263b4509ec4d47e0da3e753f85a39ea12d1eff24
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.13.3
- http://www.openwall.com/lists/oss-security/2014/02/20/16
- http://www.ubuntu.com/usn/USN-2137-1
- http://www.ubuntu.com/usn/USN-2140-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1066939
- https://github.com/torvalds/linux/commit/263b4509ec4d47e0da3e753f85a39ea12d1eff24