ConvertX is a self-hosted file conversion service. Prior to 0.18.0, the ImageMagick converter uses the unsanitized convert_to parameter to construct an output path. If an authenticated user, or an unauthenticated user when ConvertX is configured to allow unauthenticated access, uploads an extensionless image and supplies directory traversal sequences in convert_to through /convert, the constructed path escapes the intended output directory, allowing the attacker to write converted output to arbitrary container paths, potentially overwriting files or causing denial of service.
This issue is fixed in version 0.18.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
c4illin:convertx
References 4
https://github.com/C4illin/ConvertX/commit/0965928949319e2839770fbf57a8337440d4…
security-advisories@github.com
https://github.com/C4illin/ConvertX/pull/532
security-advisories@github.com
https://github.com/C4illin/ConvertX/releases/tag/v0.18.0
security-advisories@github.com
https://github.com/C4illin/ConvertX/security/advisories/GHSA-pvqw-vc5x-266j
security-advisories@github.com