Servor 1.0.0 through 4.0.2 contains a path traversal vulnerability that allows unauthenticated remote attackers to escape the served root by sending URL-encoded dot segments. Attackers can send %2e%2e/ sequences, which decodeURI() decodes before path.join() in serveStaticFile and serveDirectoryListing, to read arbitrary files and list directories outside the root.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/lukejacksonn/servor
disclosure@vulncheck.com
https://github.com/lukejacksonn/servor/commit/ec7d824ea6903c0fb97a452045bbb8335…
disclosure@vulncheck.com
https://github.com/lukejacksonn/servor/pull/70
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/servor-1.0.0-through-4.0.2-unauthenticated…
disclosure@vulncheck.com