Security restrcitions bypass in OpenResty



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-9230
CWE-ID CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 OpenResty
Server applications / Web servers

Vendor OpenResty Inc.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper input validation

EUVDB-ID: #VU11517

Risk: Low

CVSSv3.1: 6.6 [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-2018-9230

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to bypass security restrictions on the target system.

The weakness exists due to improper validation of URI parameter values when handling the ngx.req.get_uri_args and ngx.req.get_post_args functions with more than 100 parameters. A remote attacker can use GET and POST requests that contain more than 100 parameters in the affected functions, where malicious input is included in parameters after the first 100, trigger URI parameter overflow and bypass security restrictions.

Mitigation

Update to version 1.13.6.1.

Vulnerable software versions

OpenResty: 1.4.0 - 1.11.2.5

CPE2.3 External links

http://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty....


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.



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