HTTP request smuggling in Go programming language

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU21409

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16276

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 attack.

The vulnerability exists due to Go programming language accepts and normalizes HTTP requests with malformed HTTP/1.1 headers containing a space before the colon. A remote attacker can use a malformed request to bypass configured filtration and gain access to presumably restricted functionality.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.11 - 1.13

External links

http://groups.google.com/forum/m/#!topic/golang-announce/cszieYyuL9Q
http://github.com/golang/go/issues/34540
http://github.com/golang/go/commit/5a6ab1ec3e678640befebeb3318b746a64ad986c
http://github.com/golang/go/commit/6e6f4aaf70c8b1cc81e65a26332aa9409de03ad8

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.