Input validation error in Linux kernel - CVE-2013-4247
Published: August 25, 2013 / Updated: August 10, 2020
Vulnerability identifier: #VU42629
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2013-4247
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 perform a denial of service (DoS) attack.
Off-by-one error in the build_unc_path_to_root function in fs/cifs/connect.c in the Linux kernel before 3.9.6 allows remote attackers to cause a denial of service (memory corruption and system crash) via a DFS share mount operation that triggers use of an unexpected DFS referral name length.
Affected software
Linux kernel
Ubuntu
linux (Ubuntu package)
linux-lts-raring (Ubuntu package)
Ubuntu
linux (Ubuntu package)
linux-lts-raring (Ubuntu package)
How to mitigate CVE-2013-4247
Install update from vendor's website.
linux (Ubuntu package) - update to 3.8.0-27.40
linux-lts-raring (Ubuntu package) - update to 3.8.0-29.42~precise1
linux-lts-raring (Ubuntu package) - update to 3.8.0-29.42~precise1
External References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1fc29bacedeabb278080e31bb9c1ecb49f143c3b
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.9.6
- http://www.openwall.com/lists/oss-security/2013/08/14/10
- https://bugzilla.redhat.com/show_bug.cgi?id=998401
- https://github.com/torvalds/linux/commit/1fc29bacedeabb278080e31bb9c1ecb49f143c3b