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Free Audio Video Pack 2.22.0.0 - Binary Planting

CVE Category Price Severity
CVE-2020-12345 CWE-426 $500 Critical
Author Risk Exploitation Type Date
ExploitAuthor123 High Local 2020-01-27
CPE
cpe:cpe:/a:binary-planting:2.22.0.0
CVSS EPSS EPSSP
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020010202

Below is a copy:

Free Audio Video Pack 2.22.0.0 - Binary Planting
Title: Free Audio Video Pack 2.22.0.0 - Binary Planting
Date: 2020-1-27
Author: Nir Yehoshua
Product: http://www.pazera-software.com/files/FreeAudioVideoPack.7z
Tested on: Microsoft Windows 10 x64 [eng]


The Loading:

0x776B4C80 - FreeAudioVideoPack.exe used "LdrLoadDll" function to load binary with the following parameters:

#TypeNameValue
1PWSTRSearchPath16385
2PULONGDllCharacteristics0x0019eda0 = 0
3PUNICODE_STRINGName0x0019edb0 = { Length = 24, MaximumLength = 26, Buffer = 0x75a25d60 }
4PVOID*BaseAddress0x0019eda4 = 0x72e40000 "C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.18362.418_none_2e73e95e27897f63\comctl32.dll"

NTSTATUSReturnSTATUS_SUCCESS

The Vulnerability:

The intresting function starts at 0x760A4BC2, FreeAudioVideoPack.exe didn't verifing the binaries in "C:\Users\%user%\Desktop\FreeAudioVideoPack\apps\".
A potential attacker can replace the legitimate binaries in with malicious binaries and run it under FreeAudioVideoPack.exe virtual memory space: 

760A4BC2 | 55          | push ebp                                               |
760A4BC3 | 8BEC        | mov ebp,esp                                            |
760A4BC5 | 6A FF       | push FFFFFFFF                                          |
760A4BC7 | 68 D0741976 | push windows.storage.761974D0                          |
760A4BCC | 64:A1 00000 | mov eax,dword ptr fs:[0]                               |
760A4BD2 | 50          | push eax                                               |
760A4BD3 | 83EC 64     | sub esp,64                                             |
760A4BD6 | A1 541A4B76 | mov eax,dword ptr ds:[764B1A54]                        |
760A4BDB | 33C5        | xor eax,ebp                                            |
760A4BDD | 8945 F0     | mov dword ptr ss:[ebp-10],eax                          |
760A4BE0 | 53          | push ebx                                               |
760A4BE1 | 56          | push esi                                               |
760A4BE2 | 57          | push edi                                               |
760A4BE3 | 50          | push eax                                               |
760A4BE4 | 8D45 F4     | lea eax,dword ptr ss:[ebp-C]                           |
760A4BE7 | 64:A3 00000 | mov dword ptr fs:[0],eax                               |
760A4BED | 8BD9        | mov ebx,ecx                                            |
760A4BEF | 8B45 0C     | mov eax,dword ptr ss:[ebp+C]                           |
760A4BF2 | 8B55 20     | mov edx,dword ptr ss:[ebp+20]                          |
760A4BF5 | 8B4D 18     | mov ecx,dword ptr ss:[ebp+18]                          |
760A4BF8 | 8B75 1C     | mov esi,dword ptr ss:[ebp+1C]                          |
760A4BFB | 8B7D 08     | mov edi,dword ptr ss:[ebp+8]                           |
760A4BFE | 8945 A0     | mov dword ptr ss:[ebp-60],eax                          |
760A4C01 | 837D A0 00  | cmp dword ptr ss:[ebp-60],0                            |
760A4C05 | 8B45 10     | mov eax,dword ptr ss:[ebp+10]                          |
760A4C08 | 8945 9C     | mov dword ptr ss:[ebp-64],eax                          |
760A4C0B | 8B45 14     | mov eax,dword ptr ss:[ebp+14]                          |
760A4C0E | 8955 98     | mov dword ptr ss:[ebp-68],edx                          |
760A4C11 | 8B55 24     | mov edx,dword ptr ss:[ebp+24]                          |
760A4C14 | 8945 94     | mov dword ptr ss:[ebp-6C],eax                          |
760A4C17 | 894D 90     | mov dword ptr ss:[ebp-70],ecx                          |
760A4C1A | 8975 D8     | mov dword ptr ss:[ebp-28],esi                          |
760A4C1D | 8955 A4     | mov dword ptr ss:[ebp-5C],edx                          |
760A4C20 | 0F85 AA0300 | jne windows.storage.760A4FD0                           |
760A4C26 | 837D 9C 00  | cmp dword ptr ss:[ebp-64],0                            |
760A4C2A | 0F85 CF0300 | jne windows.storage.760A4FFF                           |
760A4C30 | 85C0        | test eax,eax                                           |
760A4C32 | 0F85 B10300 | jne windows.storage.760A4FE9                           |
760A4C38 | 85C9        | test ecx,ecx                                           |
760A4C3A | 0F85 B40300 | jne windows.storage.760A4FF4                           |
760A4C40 | 85F6        | test esi,esi                                           |
760A4C42 | 0F85 90D713 | jne windows.storage.761E23D8                           |
760A4C48 | 8B45 98     | mov eax,dword ptr ss:[ebp-68]                          |
760A4C4B | 85C0        | test eax,eax                                           |
760A4C4D | 0F85 90D713 | jne windows.storage.761E23E3                           |
760A4C53 | 85D2        | test edx,edx                                           |
760A4C55 | 0F85 93D713 | jne windows.storage.761E23EE                           |
760A4C5B | E8 75070C00 | call windows.storage.761653D5                          |
760A4C60 | 84C0        | test al,al                                             |
760A4C62 | 0F84 380100 | je windows.storage.760A4DA0                            |
760A4C68 | C645 AB 00  | mov byte ptr ss:[ebp-55],0                             |
760A4C6C | C745 FC 000 | mov dword ptr ss:[ebp-4],0                             |
760A4C73 | 8D8B 9C0000 | lea ecx,dword ptr ds:[ebx+9C]                          |
760A4C79 | 8B01        | mov eax,dword ptr ds:[ecx]                             |
760A4C7B | C745 EC 000 | mov dword ptr ss:[ebp-14],0                            | [ebp-14]:L"C:\\Users\\nir\\Desktop\\FreeAudioVideoPack\\apps\\3GP_to_AVI\\3gptoavi.exe"
760A4C82 | 8B70 38     | mov esi,dword ptr ds:[eax+38]                          |
760A4C85 | 8D45 EC     | lea eax,dword ptr ss:[ebp-14]                          | [ebp-14]:L"C:\\Users\\nir\\Desktop\\FreeAudioVideoPack\\apps\\3GP_to_AVI\\3gptoavi.exe"

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