Vulnerability identifier: #VU30722

Vulnerability 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]

CVE-ID: CVE-2019-17513

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ratpack
Universal components / Libraries / Libraries used by multiple products

Vendor: Ratpack

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 - 1.7.4

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

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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.