Input validation error in Linux kernel - CVE-2014-2038
Published: February 28, 2014 / Updated: August 10, 2020
Vulnerability identifier: #VU41990
CSH Severity: Medium
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2014-2038
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
Ubuntu
linux (Ubuntu package)
linux-lts-saucy (Ubuntu package)
Ubuntu
linux (Ubuntu package)
linux-lts-saucy (Ubuntu package)
How to mitigate CVE-2014-2038
Install update from vendor's website.
linux (Ubuntu package) - update to 3.11.0-18.32
linux-lts-saucy (Ubuntu package) - update to 3.11.0-18.32~precise1
linux-lts-saucy (Ubuntu package) - update to 3.11.0-18.32~precise1
External 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