Widevine Trustlet 5.x / 6.x / 7.x PRDiagVerifyProvisioning Buffer Overflow

1. INFORMATION--------------[+] CVE                : CVE-2022-48335[+] Title              : Buffer Overflow in Widevine Trustlet (PRDiagVerifyProvisioning @ 0x5f90)[+] Vendor             : Google[+] Device             : Nexus 6[+] Affected component : Widevine[+] Publication date   : March 2023[+] Credits            : CyberIntel Team2. 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), 6.0.0 (MRA58K), 6.0.0 (MRA58N), 6.0.0 (MRA58R), 6.0.0 (MRA58X), 7.0.0 (NBD90Z), 7.0.0 (NBD91P), 7.0.0 (NBD91U), 7.0.0 (NBD91X), 7.0.0 (NBD91Y), 7.0.0 (NBD91Z), 7.0.0 (NBD92F), 7.0.0 (NBD92G), 7.1.1 (N6F26Q), 7.1.1 (N6F26R), 7.1.1 (N6F26U), 7.1.1 (N6F27C), 7.1.1 (N6F27E).3. DETAILS----------To the best of our knowledge, the vulnerability described in this post has been incorrectly associated with CVE-2015-6639. After consulting with MITRE, it has been confirmed that this vulnerability had no assigned identifier. Consequently, CVE-2022-48335 has been assigned to this vulnerability. On the other hand, it has been confirmed that CVE-2015-6639 does exist and corresponds with a different vulnerability reported by Google. We have notified all the concerned parties about this misunderstanding so that the confusion can be amended.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 PRDiagVerifyProvisioning() command. This command closely resembles PRDiagClearProvisioning(), which has been featured in other blog entries (refer to CVE-2015-6647).For more details and full proof of concept visit https://cyberintel.es/cve/CVE-2022-48335_Buffer_Overflow_in_Widevine_PRDiagVerifyProvisioning_0x5f90/--Cyber Intel Team.Zero Lab - https://cyberintel.es/