PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application.
This issue is fixed in version 8.5.19.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Postcss Postcss
cpe:2.3:a:postcss:postcss:*:*:*:*:*:node.js:*:*
|
— |
8.5.23
|
References 3
https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5…
security-advisories@github.com
https://github.com/postcss/postcss/releases/tag/8.5.19
security-advisories@github.com
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp
security-advisories@github.com