GMS-2020-796: Directory Traversal in yjmyjmyjm

September 1, 2020 (updated September 23, 2021)

Affected versions of yjmyjmyjm resolve relative file paths, resulting in a directory traversal vulnerability. A malicious actor can use this vulnerability to access files outside of the intended directory root, which may result in the disclosure of private files on the vulnerable system.

Example request:

GET /../../../../../../../../../../etc/passwd HTTP/1.1
host:foo

Recommendation

No patch is available for this vulnerability.

It is recommended that the package is only used for local development, and if the functionality is needed for production, a different package is used instead.

References

github.com/JacksonGL/NPM-Vuln-PoC/blob/master/directory-traversal/yjmyjmyjm
github.com/advisories/GHSA-g376-whg7-896m
www.npmjs.com/advisories/451

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