Vulnerability identifier: #VU26234
Vulnerability risk: Medium
CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H/E:P/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-125
Exploitation vector: Network
Exploit availability: Yes
Vulnerable software:
nginx
Server applications /
Web servers
Vendor: NGINX
Description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when processing rewrite rules with a '\0' character in ngx_http_core_module.c. An attacker with ability to influence a rewrite rule can view memory contents via Location HTTP header.
Successful exploitation of vulnerability requires that an attacker can influence rewrite engine, as demonstrated with OpenResty issue.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
nginx: 1.17.0 - 1.17.6, 1.16.0 - 1.16.1, 1.15.0 - 1.15.12, 1.14.0 - 1.14.2, 1.13.0 - 1.13.12, 1.12.0 - 1.12.2, 1.11.0 - 1.11.13, 1.10.0 - 1.10.3, 1.9.0 - 1.9.15, 1.8.0 - 1.8.1, 1.7.0 - 1.7.12, 1.6.0 - 1.6.3, 1.5.0 - 1.5.13, 1.4.0 - 1.4.7, 1.3.0 - 1.3.16, 1.2.0 - 1.2.9, 1.1.0 - 1.1.19, 1.0.0 - 1.0.15, 0.9.0 - 0.9.7, 0.8.0 - 0.8.55, 0.7.0 - 0.7.69, 0.6.0 - 0.6.1516, 0.5.0 - 0.5.38, 0.4.0 - 0.4.14, 0.3.0 - 0.3.61
External links
http://hackerone.com/reports/513236
http://seclists.org/oss-sec/2020/q1/113
http://github.com/nginx/nginx/commit/a5895eb502747f396d3901a948834cd87d5fb0c3
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. However, proof of concept for this vulnerability is available.