Ubuntu update for nginx

1) Privilege escalation

EUVDB-ID: #VU1082

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2016-1247

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a local user to gain elevated privileges on the target system.
The weakness is due to improper handling of log file permissions in the '/var/log/nginx' directory by nginx packages. A locall attacker with 'www-data' user privileges can obtain root privileges on the target system.
Successful exploitation of the vulnerability results in privilege escalation on the vulnerable system.

Mitigation

Update the affected packages

Ubuntu 16.10:

nginx-extras 1.10.1-0ubuntu1.1

nginx-full 1.10.1-0ubuntu1.1

nginx-common 1.10.1-0ubuntu1.1

nginx-light 1.10.1-0ubuntu1.1

nginx-core 1.10.1-0ubuntu1.1

Ubuntu 16.04 LTS:

nginx-extras 1.10.0-0ubuntu0.16.04.3

nginx-full 1.10.0-0ubuntu0.16.04.3

nginx-common 1.10.0-0ubuntu0.16.04.3

nginx-light 1.10.0-0ubuntu0.16.04.3

nginx-core 1.10.0-0ubuntu0.16.04.3

Ubuntu 14.04 LTS:

nginx-extras 1.4.6-1ubuntu3.6

nginx-full 1.4.6-1ubuntu3.6

nginx-common 1.4.6-1ubuntu3.6

nginx-light 1.4.6-1ubuntu3.6

nginx-core 1.4.6-1ubuntu3.6

Vulnerable software versions

Ubuntu: 14.04 - 16.10

External links

http://www.ubuntu.com/usn/usn-3114-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.