Remote code execution in NGINX LDAP reference implementation

1) Input validation error

EUVDB-ID: #VU62075

Risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: N/A

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP request within NGINX LDAP reference implementation, when nginx or nginx plus are configured to proxy LDAP requests. A remote attacker can pass specially crafted input to the application and bypass LDAP authentication or execute arbitrary commands on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise the affected system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

nginx-ldap-auth: 0.0.1 - 0.0.5

CPE2.3

• cpe:2.3:a:nginx:nginx-ldap-auth:0.0.1:*:*:*:*:*:*:
• cpe:2.3:a:nginx:nginx-ldap-auth:0.0.2:*:*:*:*:*:*:
• cpe:2.3:a:nginx:nginx-ldap-auth:0.0.3:*:*:*:*:*:*:

External links

http://www.nginx.com/blog/addressing-security-weaknesses-nginx-ldap-reference-implementation/

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.