Vba32 Antivirus v3.36.0 - DoS

5.5

Medium

Discovered by 

Andres Roldan

Offensive Team, Fluid Attacks

Summary

Full name

Vba32 Antivirus v3.36.0 - Denial of Service (DoS)

Code name

State

Public

Release date

Jan 29, 2024

Affected product

Vba32 Antivirus

Vendor

VirusBlokAda

Affected version(s)

Version 3.36.0

Vulnerability name

Denial of Service (DoS)

Remotely exploitable

No

CVSS v3.0 vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.0 base score

5.5

Exploit available

Yes

Description

Vba32 Antivirus v3.36.0 is vulnerable to a Denial of Service vulnerability by triggering the 0x2220A7 IOCTL code of the Vba32m64.sys driver.

Vulnerability

The 0x2220A7 IOCTL code of the Vba32m64.sys driver is vulnerable to DoS, leading to a BSOD of the affected computer caused by a NULL pointer dereference. If an attacker sends an nOutBufferSize parameter greater or equal than 0x2E, the execution flow will reach the function sub_11B34 which doesn't verify the return address of another routine:

v2 = sub_128A8((__int64)&qword_1D710);
v3 = v2; // [1]
if ( v2 )
{
    v4 = sub_12750(v2);
}
else
{
    v5 = sub_128A8((__int64)&qword_1D600);
    v3 = v5;
    if ( !v5 )
        return 0;
    v4 = sub_1278C(v5, 2i64);
    *(_QWORD *)(v3 + 0x50) = MEMORY[0xFFFFF78000000014] + 0x2FAF080i64;
    sub_12830(&qword_1D650, v3);
}
v6 = (_WORD *)(a1 + 0x2C);
*(_QWORD *)(a1 + 0x10) = *(_QWORD *)(v3 + 0x40); // [2]

At [1], the return value is assigned to a variable which is then dereferenced at [2] without checking for its value, leading to a NULL pointer dereference:

rax=0000000000000000 rbx=0000000000000000 rcx=0000000000000001
rdx=0000000000000001 rsi=00000000031ac0f4 rdi=00000000031ac120
rip=fffff80447e41b6e rsp=ffffc9816c7fc730 rbp=0000000000000000
 r8=00000000ffffffff  r9=7ffff80447e4d6b0 r10=7ffffffffffffffc
r11=0000000000000000 r12=0000000000000020 r13=0000000000000030
r14=ffffe20fa72678b0 r15=ffffe20fa0e9b060
iopl=0         nv up ei pl zr na po nc
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00050246
Vba32m64+0x1b6e:
fffff804`47e41b6e 488b4340        mov     rax,qword ptr [rbx+40h] ds:002b:00000000`00000040

Our security policy

We have reserved the ID CVE-2024-23441 to refer to this issue from now on.

Disclosure policy

System Information

  • Version: Vba32 Antivirus v3.36.0

  • Operating System: Windows

Mitigation

There is currently no patch available for this vulnerability.

References

Timeline

Vulnerability discovered

Jan 16, 2024

Vendor contacted

Jan 16, 2024

Vendor replied

Jan 18, 2024

Public disclosure

Jan 29, 2024

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Fluid Attacks' solutions enable organizations to identify, prioritize, and remediate vulnerabilities in their software throughout the SDLC. Supported by AI, automated tools, and pentesters, Fluid Attacks accelerates companies' risk exposure mitigation and strengthens their cybersecurity posture.

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