1) Input validation error

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-17513

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

An issue was discovered in Ratpack before 1.7.5. Due to a misuse of the Netty library class DefaultHttpHeaders, there is no validation that headers lack HTTP control characters. Thus, if untrusted data is used to construct HTTP headers with Ratpack, HTTP Response Splitting can occur.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Ratpack: 1.7.0, 1.7.1, 1.7.2, 1.7.3, 1.7.4

CPE

• cpe:2.3:a:ratpack:ratpack:1.7.0:*:*:*:*::*:*
• cpe:2.3:a:ratpack:ratpack:1.7.1:*:*:*:*::*:*
• cpe:2.3:a:ratpack:ratpack:1.7.2:*:*:*:*::*:*
• cpe:2.3:a:ratpack:ratpack:1.7.3:*:*:*:*::*:*
• cpe:2.3:a:ratpack:ratpack:1.7.4:*:*:*:*::*:*

External links

https://github.com/ratpack/ratpack/commit/c560a8d10cb8bdd7a526c1ca2e67c8f224ca23ae
https://github.com/ratpack/ratpack/commit/efb910d38a96494256f36675ef0e5061097dd77d
https://github.com/ratpack/ratpack/releases/tag/v1.7.5
https://github.com/ratpack/ratpack/security/advisories/GHSA-mvqp-q37c-wf9j
https://ratpack.io/versions/1.7.5

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.