Input validation error in ruby (Alpine package)

1) Input validation error

EUVDB-ID: #VU23007

Risk: Medium

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

CVE-ID: CVE-2019-16201

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the WEBrick::HTTPAuth::DigestAuth in Ruby due to a regular expression issue. A remote attacker can send a specially crafted request to the application and perform a denial of service 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):

CPE2.3

• cpe:2.3:o:alpine:ruby_alpine_package:1.8.7-r0:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:ruby_alpine_package:1.8.7_p299-r1:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:ruby_alpine_package:1.8.7_p352-r0:*:*:*:*:alpine_linux:*:2.3
• cpe:2.3:o:alpine:ruby_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=9f704bf9da4bdb94ea9e7bcee0259b0b5f8f937d
https://git.alpinelinux.org/aports/commit/?id=b8817649bf6c0bceb6e5ad1133c8436de4a889ab
https://git.alpinelinux.org/aports/commit/?id=fba16f258980f2a04d905339e7b167b481e8f5d6
https://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.