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Widevine Trustlet 5.x drm_save_keys Buffer Overflow

Widevine Trustlet 5.x drm_save_keys Buffer Overflow
Posted May 30, 2023
Authored by CyberIntel Team | Site cyberintel.es

Widevine Trustlet versions 5.x suffer from a buffer overflow vulnerability in drm_save_keys at 0x6a18.

tags | advisory, overflow
advisories | CVE-2022-48332
SHA-256 | 00618858615635079c0c4a2ffcbd253c46d153cd5b7d1bc89147c9f06425280a

Widevine Trustlet 5.x drm_save_keys Buffer Overflow

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1. INFORMATION
--------------
[+] CVE : CVE-2022-48332
[+] Title : Buffer Overflow in Widevine Trustlet
(drm_save_keys @ 0x6a18)
[+] Vendor : Google
[+] Device : Nexus 6
[+] Affected component : Widevine
[+] Publication date : March 2023
[+] Credits : CyberIntel Team



2. AFFECTED VERSIONS
--------------------
5.0.0 (LRX21O), 5.0.1 (LRX22C), 5.1.0 (LMY47D), 5.1.0 (LMY47E), 5.1.0
(LMY47I), 5.1.0 (LMY47M), 5.1.1 (LMY47Z), 5.1.1 (LMY48I), 5.1.1
(LMY48M), 5.1.1 (LMY48T), 5.1.1 (LMY48W), 5.1.1 (LMY48X), 5.1.1
(LMY48Y), 5.1.1 (LVY48C), 5.1.1 (LVY48E), 5.1.1 (LVY48F), 5.1.1
(LVY48H), 5.1.1 (LVY48I), 5.1.1 (LYZ28E), 5.1.1 (LYZ28J), 5.1.1
(LYZ28K), 5.1.1 (LYZ28M), 5.1.1 (LYZ28N)



3. DETAILS
----------
Qualcomm Secure Execution Environment is one of the most widespread
commercial TEE solutions in the smartphone space, used by many different
devices such as Xiaomi, Motorola and several devices of the Google Nexus
and Pixel series. Widevine is a Digital Rights Management (DRM)
technology developed by Google to protect copyrighted content and to
enable secure distribution and consumption of video and audio content.
The technology involves encryption, licensing, and key management to
ensure that content can only be decrypted and played back on authorized
devices. An attacker with high privileges in Normal World can exploit
the vulnerability to compromise the Trusted Application running in the
Secure World, eventually executing arbitrary code and reading and/or
modifying information of critical files, compromising the
confidentiality and integrity of the system. On the other hand, the
attacker is able to crash the Trusted Application, potentially resulting
in a denial of service.

The bug is present in Widevine’s drm_save_keys() command. This command
closely resembles drm_verify_keys(), which has been featured in other
blog entries (refer to CVE-2022-48333 and CVE-2022-48334).

For more details and full proof of concept visit
https://cyberintel.es/cve/CVE-2022-48332_Buffer_Overflow_in_Widevine_drm_save_keys_0x6a18/


--
Cyber Intel Team.
Zero Lab - https://cyberintel.es/

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