[Security] Bump tar from 6.2.0 to 6.2.1 in /assets
Bumps tar from 6.2.0 to 6.2.1. This update includes a security fix.
Vulnerabilities fixed
Denial of service while parsing a tar file due to lack of folders count validation
Description:
During some analysis today on npm's
node-tar
package I came across the folder creation process, Basicly if you provide node-tar with a path like this./a/b/c/foo.txt
it would create every folder and sub-folder here a, b and c until it reaches the last folder to createfoo.txt
, In-this case I noticed that there's no validation at all on the amount of folders being created, that said we're actually able to CPU and memory consume the system running node-tar and even crash the nodejs client within few seconds of running it using a path with too many sub-folders insideSteps To Reproduce:
You can reproduce this issue by downloading the tar file I provided in the resources and using node-tar to extract it, you should get the same behavior as the video
Proof Of Concept:
Here's a video show-casing the exploit:
Impact
Denial of service by crashing the nodejs client when attempting to parse a tar archive, make it run out of heap memory and consuming server CPU and memory resources
Report resources
Note
This report was originally reported to GitHub bug bounty program, they asked me to report it to you a month ago
Patched versions: 6.2.1 Affected versions: < 6.2.1
Commits
-
bef7b1e
6.2.1 -
fe8cd57
prevent extraction in excessively deep subfolders -
fe7ebfd
remove security.md - See full diff in compare view