> CVE-2023-32874: Mediatek Baseband Excessive Number of SDP rtpmap Entries Leads to Stack Buffer Overflow

An attacker sending a malformed SIP message over VoLTE to a device with a Mediatek baseband can trigger the vulnerability described here. The impact is stack buffer overflow in the baseband, triggered by malformed SDP data in VoLTE message such as SIP INVITE or MESSAGE request. The vulnerability described in this advisory affected a wide range of Mediatek devices. The January 2024 issue of the Mediatek Security Bulletin contains this vulnerability as CVE-2023-32874. Vulnerability Details When a SIP message contains SDP data, first the cc_call_unpack_sdpmsg routine is invoked to unpack the message bytes into an internal representation (sdp_message_struct). Later the codec information is extracted from this internal representation by calling several codec extracting functions.