Vulnerability CVE-2011-2928
Published: 2011-08-29   Modified: 2012-02-13

Description:
The befs_follow_link function in fs/befs/linuxvfs.c in the Linux kernel before 3.1-rc3 does not validate the length attribute of long symlinks, which allows local users to cause a denial of service (incorrect pointer dereference and OOPS) by accessing a long symlink on a malformed Be filesystem.

See advisories in our WLB2 database:
Topic
Author
Date
Low
Linux kernel: ZERO_SIZE_PTR dereference for long symlinks in Be FS
Timo Warns
01.09.2011

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Kernel 
Linux -> Linux kernel 

 References:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=338d0f0a6fbc82407864606f5b64b75aeb3c70f2
http://securityreason.com/securityalert/8360
http://www.kernel.org/pub/linux/kernel/v3.0/testing/ChangeLog-3.1-rc3
http://www.openwall.com/lists/oss-security/2011/08/19/1
http://www.openwall.com/lists/oss-security/2011/08/19/5
http://www.pre-cert.de/advisories/PRE-SA-2011-06.txt
http://www.securityfocus.com/archive/1/519387/100/0/threaded
http://www.securityfocus.com/bid/49256
https://exchange.xforce.ibmcloud.com/vulnerabilities/69343
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