#VU55666 Insufficient verification of data authenticity in bundler - CVE-2020-36327
Vulnerability identifier: #VU55666
Vulnerability risk: High
CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2020-36327
CWE-ID:
CWE-345
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
bundler
Universal components / Libraries /
Software for developers
Vendor: Bundler
Description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient verification of data authenticity in Bundler, when choosing a dependency source. The application selects a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be chosen, even if the intended choice was a private gem that is a dependency of another private gem that is explicitly depended on by the application.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
bundler: 1.6.0 rc - 2.2.17
External links
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105
https://github.com/rubygems/rubygems/issues/3982
https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
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.
