Vulnerability CVE-2015-1328
Published: 2016-11-27   Modified: 2016-11-28

Description:
The overlayfs implementation in the linux (aka Linux kernel) package before 3.19.0-21.21 in Ubuntu through 15.04 does not properly check permissions for file creation in the upper filesystem directory, which allows local users to obtain root access by leveraging a configuration in which overlayfs is permitted in an arbitrary mount namespace.

See advisories in our WLB2 database:
Topic
Author
Date
High
Ubuntu 12.04, 14.04, 14.10, 15.04 overlayfs Local Root (Shell)
rebel
16.06.2015
Med.
Overlayfs Privilege Escalation
rebel
02.11.2016

Type:

CWE-264

 (Permissions, Privileges, and Access Controls)

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Linux -> Linux kernel 
Canonical -> Ubuntu linux 

 References:
http://seclists.org/oss-sec/2015/q2/717
http://www.exploit-db.com/exploits/40688/
http://www.securityfocus.com/bid/75206
https://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-1328.html
https://security-tracker.debian.org/tracker/CVE-2015-1328
https://www.exploit-db.com/exploits/37292/
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