HTTP Response Splitting in ruby (Alpine package)

1) HTTP Response Splitting

EUVDB-ID: #VU23008

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16254

CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform HTTP response splitting attack.

The vulnerability exists due to insufficient validation of CRLF sequences within the WEBrick in Ruby. A remote attacker can send a specially crafted request to the application and perform a spoofing attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ruby (Alpine package): 1.8.7-r0 - 2.5.5-r0

ruby (Alpine package):

External links

http://git.alpinelinux.org/aports/commit/?id=4badd65f51c8099060803ef81deb2857141a06cd
http://git.alpinelinux.org/aports/commit/?id=9f704bf9da4bdb94ea9e7bcee0259b0b5f8f937d
http://git.alpinelinux.org/aports/commit/?id=b8817649bf6c0bceb6e5ad1133c8436de4a889ab
http://git.alpinelinux.org/aports/commit/?id=fba16f258980f2a04d905339e7b167b481e8f5d6
http://git.alpinelinux.org/aports/commit/?id=b21ba46a1a4971aee0a5432e0f30b42ff7d8ccdf

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.