Inconsistent interpretation of HTTP requests in nginx (Alpine package)

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU24230

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-20372

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists with certain error_page configurations. A remote attacker can read unauthorized web pages in environments where NGINX is being fronted by a load balancer.

Mitigation

Install update from vendor's website.

Vulnerable software versions

nginx (Alpine package): 1.6.1-r0 - 1.14.2-r4

nginx (Alpine package):

CPE2.3

• cpe:2.3:a:alpine:nginx_alpine_package:1.6.1-r0:*:*:*:*:alpine_linux:*:2.7
• cpe:2.3:a:alpine:nginx_alpine_package:1.6.2-r0:*:*:*:*:alpine_linux:*:3.0
• cpe:2.3:a:alpine:nginx_alpine_package:1.6.2-r1:*:*:*:*:alpine_linux:*:3.0
• cpe:2.3:a:alpine:nginx_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=d47526fa9b80409c05cb72d95cb44f39a818d02b
https://git.alpinelinux.org/aports/commit/?id=390b341e36d575528904054fbd72fade6b1e8e3d
https://git.alpinelinux.org/aports/commit/?id=17143c4ab9960948114150119256c856dabd1ccb
https://git.alpinelinux.org/aports/commit/?id=732a2a015029f60efed0ccc9118d8a16bf7f860e
https://git.alpinelinux.org/aports/commit/?id=dd81abbcbedbddfc50c0d20af4559ecc142d2278

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.