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Advisories

BrowserStack Runner 0.9.5 Unauthenticated RCE via /_log HTTP Handler

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severity
high
date
Affecting

  • BrowserStack Runner <= 0.9.5

  • An affected version range remains undefined

CWE
  • CWE-94 Improper Control of Generation of Code ('Code Injection')
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Christ Bouchuen
Description
BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the handler, which passes user-supplied data to vm.runInNewContext() combined with eval(). Attackers can escape the Node.js vm sandbox by leveraging a host-context Function reference through util.format to access the host process via this.constructor.constructor, achieving full remote code execution on the underlying system without any authentication.

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