Permissions, Privileges, and Access Controls in nginx

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32617

Risk: Medium

CVSSv3.1: 6.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2013-4547

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

Exploit availability: Yes

Description

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

nginx 0.8.41 through 1.4.3 and 1.5.x before 1.5.7 allows remote attackers to bypass intended restrictions via an unescaped space character in a URI.

Mitigation

Install update from vendor's website.

Vulnerable software versions

nginx: 0.8.41 - 1.4.3

External links

http://lists.opensuse.org/opensuse-security-announce/2013-12/msg00007.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00084.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00118.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00119.html
http://mailman.nginx.org/pipermail/nginx-announce/2013/000125.html
http://secunia.com/advisories/55757
http://secunia.com/advisories/55822
http://secunia.com/advisories/55825
http://www.debian.org/security/2012/dsa-2802

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. However, proof of concept for this vulnerability is available.