The gist RubyGem before 6.1.0 contains an improper certificate validation vulnerability that allows on-path attackers to intercept HTTPS traffic because http_connection in lib/gist.rb sets VERIFY_NONE. Attackers can present any certificate to read or modify GitHub API traffic, stealing OAuth tokens and login credentials to read and modify the victim's gists.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
defunkt:gist
References 5
https://github.com/defunkt/gist/issues/373
GitHub Issue #373
https://github.com/defunkt/gist
NVD
https://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468
NVD
https://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcf
NVD
https://www.vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-cer…
VulnCheck Advisory: Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification