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Advisories

OpenMage magento-lts before 20.19.0 Race Condition in Coupon Usage Limits

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Severity
medium
Date
Affecting

  • magento-lts >= 0, < 20.19.0

  • magento-lts >= 21.0.0-beta1, < 21.0.0-beta3

CWE
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
skeletonsec, colinmollenhour
Description
OpenMage magento-lts before 20.19.0 and 21.0.0-beta1 before 21.0.0-beta3 contains a race condition in shopping cart price rule usage limits, because Mage_SalesRule_Model_Validator checks coupon limits without locking and the usage counters are later incremented non-atomically. Unauthenticated attackers, including guest shoppers, can submit concurrent checkouts to redeem a limited coupon more times than its cap allows.

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