Vulnerability CVE-2018-12233
Published: 2018-06-12

Description:
In the ea_get function in fs/jfs/xattr.c in the Linux kernel through 4.17.1, a memory corruption bug in JFS can be triggered by calling setxattr twice with two different extended attribute names on the same file. This vulnerability can be triggered by an unprivileged user with the ability to create files and execute programs. A kmalloc call is incorrect, leading to slab-out-of-bounds in jfs_xattr.

Type:

CWE-119

 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Linux -> Linux kernel 
Canonical -> Ubuntu linux 

 References:
http://www.securityfocus.com/bid/104452
https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html
https://lkml.org/lkml/2018/6/2/2
https://marc.info/?l=linux-kernel&m=152814391530549&w=2
https://usn.ubuntu.com/3752-1/
https://usn.ubuntu.com/3752-2/
https://usn.ubuntu.com/3752-3/
https://usn.ubuntu.com/3753-1/
https://usn.ubuntu.com/3753-2/
https://usn.ubuntu.com/3754-1/
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