#VU21409 Inconsistent interpretation of HTTP requests in Go programming language - CVE-2019-16276

Vulnerability identifier: #VU21409

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Go programming language
Universal components / Libraries / Scripting languages

Vendor: Google

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 rc1 - 1.13

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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

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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.