Input validation error in ruby (Alpine package)

1) Input validation error

EUVDB-ID: #VU32366

Risk: Medium

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

CVE-ID: CVE-2015-4020

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

RubyGems 2.0.x before 2.0.17, 2.2.x before 2.2.5, and 2.4.x before 2.4.8 does not validate the hostname when fetching gems or making API requests, which allows remote attackers to redirect requests to arbitrary domains via a crafted DNS SRV record with a domain that is suffixed with the original domain name, aka a "DNS hijack attack." NOTE: this vulnerability exists because to an incomplete fix for CVE-2015-3900.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ruby (Alpine package): 2.0.0-r0 - 2.2.2-r0

CPE2.3

• cpe:2.3:o:alpine:ruby_alpine_package:2.0.0-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:ruby_alpine_package:2.0.0_p247-r1:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:ruby_alpine_package:2.0.0_p247-r3:*:*:*:*:alpine_linux:*:2.6

External links

https://git.alpinelinux.org/aports/commit/?id=e250c76922397fa0d703340c9309b47512d5090d

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.