Ubuntu update for nginx

1) Null pointer dereference in ngx_chain_to_iovec()

EUVDB-ID: #VU25

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-4450

CWE-ID: CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service conditions on the target system.

The vulnerability exists due to an access control error in the ngx_chain_to_iovec() function, when saving the client request body to a temporary file. A remote unauthenticated attacker can cause a null pointer dereference in the ngx_chain_to_iovec() function by sending specially crafted data.

Successful exploitation of this vulnerability may lead to the crash of a worker process.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:

nginx-extras 1.10.0-0ubuntu0.16.04.2

nginx-full 1.10.0-0ubuntu0.16.04.2

nginx-core 1.10.0-0ubuntu0.16.04.2

nginx-light 1.10.0-0ubuntu0.16.04.2

Ubuntu 15.10:

nginx-extras 1.9.3-1ubuntu1.2

nginx-full 1.9.3-1ubuntu1.2

nginx-core 1.9.3-1ubuntu1.2

nginx-light 1.9.3-1ubuntu1.2

Ubuntu 14.04 LTS:

nginx-extras 1.4.6-1ubuntu3.5

nginx-full 1.4.6-1ubuntu3.5

nginx-core 1.4.6-1ubuntu3.5

nginx-light 1.4.6-1ubuntu3.5

Vulnerable software versions

Ubuntu: 14.04 - 16.04

External links

http://www.ubuntu.com/usn/usn-2991-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.