Vba32 Antivirus v3.36.0 - AMR

Summary


Name	Vba32 Antivirus v3.36.0 - Arbitrary Memory Read
Code name	Adderley
Product	Vba32 Antivirus
Vendor	VirusBlokAda
Affected versions	Version 3.36.0
State	Public
Release date	2024-01-29

Vulnerability


Kind	Arbitrary Memory Read
Rule	111. Out-of-bounds Read
Remote	No
CVSSv3 Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
CVSSv3 Base Score	6.3
Exploit available	Yes
CVE ID(s)	CVE-2024-23439, CVE-2024-23440

Description

Vba32 Antivirus v3.36.0 is vulnerable to an Arbitrary Memory Read (AMR) vulnerability by triggering the 0x22201B, 0x22201F, 0x222023, 0x222027 ,0x22202B, 0x22202F, 0x22203F, 0x222057 and 0x22205B IOCTL codes of the Vba32m64.sys driver.

CVE-2024-23439

The 0x22201B, 0x22201F, 0x222023, 0x222027 ,0x22202B, 0x22202F, 0x22203F, 0x222057 and 0x22205B IOCTL codes of the Vba32m64.sys driver allows to perform a partial Arbitrary Memory Read. The attacker can control the address from where to perform the read by supplying an arbitrary pointer in the lpInBuffer parameter of the IOCTL call, but there's currently not leak of the result of such read to user-space. However, the invalid address will cause a BSOD which leads to a Denial of Service of the affected computer.

rax=000000000022201b rbx=000000000022201b rcx=4141414141414141
rdx=ffffb001f2328190 rsi=4141414141414141 rdi=ffffb001f2328190
rip=fffff800672b1383 rsp=ffffe38230292750 rbp=000001e1d8b10000
 r8=000000000000000e  r9=ffffb001f24910a0 r10=fffff800672b9724
r11=0000000000000000 r12=0000000000000008 r13=0000000000000038
r14=ffffb001f6eb61e0 r15=ffffb001f24910a0
iopl=0         nv up ei ng nz na po nc
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00050286
Vba32m64+0x1383:
fffff800`672b1383 0fb701          movzx   eax,word ptr [rcx] ds:002b:41414141`41414141=????

CVE-2024-23440

The 0x22200B IOCTL code of the Vba32m64.sys driver allows to read up to 0x802 of memory from ar arbitrary user-supplied pointer. The attacker can control the address from where to perform the read by supplying an arbitrary pointer in the lpInBuffer parameter of the IOCTL call. The vulnerable IOCTL will copy up to 0x802 bytes to a global variable of the driver. There's not evidence of the leak of the result of such read to user-space. However, the invalid address will cause a BSOD which leads to a Denial of Service of the affected computer.

1: kd> dps rdx
00000000`ffff0000  ????????`????????
00000000`ffff0008  ????????`????????
00000000`ffff0010  ????????`????????
00000000`ffff0018  ????????`????????
00000000`ffff0020  ????????`????????
00000000`ffff0028  ????????`????????

rax=000000000022201b rbx=0000000000000000 rcx=fffff80349241530
rdx=000007fdb6daf2d0 rsi=00000000ffff0000 rdi=ffffe70f541c69d0
rip=fffff8034923a0e1 rsp=ffffc80bdb061778 rbp=00000000ffff0000
 r8=0000000000000802  r9=ffffe70f540b60a0 r10=fffff80349239724
r11=fffff80349240d30 r12=0000000000000802 r13=0000000000000802
r14=ffffe70f5819ebc0 r15=ffffe70f540b60a0
iopl=0         nv up ei ng nz na po nc
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00050286
Vba32m64+0xa0e1:
fffff803`4923a0e1 668b040a        mov     ax,word ptr [rdx+rcx] ds:002b:00000000`ffff0800=????