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Advisories

OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

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severity
medium
date
Affecting

  • OP-TEE OS <= 4.10.0, fixed in commit 0aadfc2

CWE
  • CWE-476 NULL Pointer Dereference
CVSS
5.7
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Argus Systems - ByteRay Ltd.
Description
OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA open_session handler that allows Normal World clients to cause a denial of service when CFG_WIDEVINE_PTA is enabled. Attackers can open a session directly on the Widevine PTA to trigger an unconditional dereference of a NULL calling session pointer via is_user_ta_ctx(), faulting the TEE at S-EL1 and crashing the trusted execution environment.

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