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WS-2021-0082
Date: May 4, 2021
An issue has been discovered in comrak. The project operates by default in a "safe" mode of operation where unsafe content, such as arbitrary raw HTML or URLs with non-standard schemes, are not permitted in the output. This is per the reference GFM implementation, cmark-gfm. Ampersands were not being correctly escaped in link targets, making it possible to fashion unsafe URLs using schemes like data: or javascript: by entering them as HTML entities, e.g. data:. The intended behavior, demonstrated upstream, is that these should be escaped and therefore harmless, but this behavior was broken in comrak.
Language: RUST
Severity Score
Severity Score
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-22CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | LOCAL |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | NONE |
| Availability (A): | HIGH |