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Advisories

Perspective 5.0.0 DoS via Loop Expression Evaluation

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severity
high
date
Affecting

  • Perspective <= 5.0.0

  • An affected version range remains undefined

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
7.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Christ Bowel Bouchuen
Description
Perspective 5.0.0 contains a denial of service vulnerability that allows remote attackers to block the server event loop indefinitely by submitting a crafted expression containing unbounded for or while loop constructs in a TableMakeViewReq message. Attackers can embed an arbitrarily large iteration count in an expression column evaluated once per table row, causing the Tornado IOLoop to block without any iteration cap, deadline, or cancellation check, rendering the server unresponsive to all connected clients.

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