Permissions, Privileges, and Access Controls in nginx

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU42416

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-0337

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

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The default configuration of nginx, possibly 1.3.13 and earlier, uses world-readable permissions for the (1) access.log and (2) error.log files, which allows local users to obtain sensitive information by reading the files. AV:N per http://www.gentoo.org/security/en/glsa/glsa-201310-04.xml and per http://secunia.com/advisories/55181

Mitigation

Install update from vendor's website.

Vulnerable software versions

nginx: 1.0.0 - 1.3.12

External links

http://secunia.com/advisories/55181
http://security.gentoo.org/glsa/glsa-201310-04.xml
http://www.openwall.com/lists/oss-security/2013/02/21/15
http://www.openwall.com/lists/oss-security/2013/02/22/1
http://www.openwall.com/lists/oss-security/2013/02/24/1

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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