HTTP request smuggling in Go programming language

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU21409

Risk: Medium

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

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

CPE2.3

• cpe:2.3:a:google:golang:1.11:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11:rc1:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11:rc2:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11beta1:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11beta2:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11beta3:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11.1:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11.2:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11.3:*:*:*:*:*:*:*
• cpe:2.3:a:google:golang:1.11.4:*:*:*:*:*:*:*

External links

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