

Advisories

Watchdog Antivirus v1.6.415 - DoS

5.5

Medium

Discovered by

Andres Roldan

Offensive Team, Fluid Attacks

Summary

Full name

Watchdog Antivirus v1.6.415 - Denial of Service

Code name

Cole

State

Public

Release date

Apr 22, 2024

Affected product

Watchdog Antivirus

Vendor

Watchdog

Affected version(s)

Version 1.6.415

Vulnerability name

Denial of Service (DoS)

Vulnerability type

002. Asymmetric Denial of Service

Remotely exploitable

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

CVE ID(s)

CVE-2024-1241

Description

Watchdog Antivirus v1.6.415 is vulnerable to a Denial of Service vulnerability by triggering the 0x80002014 IOCTL code of the wsdk-driver.sys driver.

Vulnerability

The 0x80002014 IOCTL code of the wsdk-driver.sys driver allows to perform a Denial of Service, leading to a BSOD of the affected computer caused by a NULL pointer dereference.

The disassembled vulnerable function is sub_140008D5C:

__int64 __fastcall sub_140008D5C(HANDLE ProcessId) // [3]
{
 __int64 v1; // rbx
 const char *ProcessImageFileName; // rdi
 NTSTATUS v3; // eax
 int v4; // edx
 int v5; // r8d
 PEPROCESS Process; // [rsp+48h] [rbp+10h] BYREF

 Process = 0i64;
 v1 = (unsigned int)ProcessId;
 ProcessImageFileName = 0i64;
 v3 = PsLookupProcessByProcessId((HANDLE)(unsigned int)ProcessId, &Process);
 if ( v3 < 0 )
 {
 if ( off_140005250 != &off_140005250 )
 {
 _mm_lfence();
 LOBYTE(v4) = 3;
 sub_140001084((int)off_140005248->DeviceExtension, v4, v5, 0x14, (__int64)&unk_140003960, v3);
    }
  }
  else
  {
    ProcessImageFileName = (const char *)PsGetProcessImageFileName(Process);  // [2]
    ObfDereferenceObject(Process);
  }
  if ( stricmp(ProcessImageFileName, "WAV.exe") )  // [3]
    return 0xC0000001i64;
  qword_140005298 = v1;
  return 0i64

The sub_140008D5C function tries to find the process instance of the WAV.exe executable. It receives a parameter called ProcessId at [1], tries to find the image filename with PsGetProcessImageFileName at [2] and compares if the file name matches with WAV.exe using stricmp() at [3]. However, the parameter ProcessId can be controlled by the attacker, making the result of PsGetProcessImageFileName to be NULL, performing an invalid comparison with stricmp(), resulting in a NULL pointer dereference:

CONTEXT:  ffffca0f2802ed20 -- (.cxr 0xffffca0f2802ed20)
rax=0000000000000000 rbx=0000000041414141 rcx=0000000000000000
rdx=fffff80172caac80 rsi=0000000080002014 rdi=0000000000000000
rip=fffff80177dcc6b2 rsp=ffffca0f2802f728 rbp=ffffcf0c89df45c0
 r8=0000000000000000  r9=ffffcf0c8efe40a8 r10=fffff80172caac80
r11=0000000000000000 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=ffffcf0c8e61d8f0
iopl=0         nv up ei ng nz na po nc
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00050286
nt!_ascii_stricmp+0x6:
fffff801`77dcc6b2 450fb603        movzx   r8d,byte ptr [r11] ds:002b:00000000`00000000=??
Resetting default scope

PROCESS_NAME:  IOCTLBruteForce.exe

STACK_TEXT:
ffffca0f`2802f728 fffff801`77dcc709     : ffffca0f`28020014 ffffca0f`2802f788 00000000`00000004 00000000`00000000 : nt!_ascii_stricmp+0x6
ffffca0f`2802f730 fffff801`72ca8de7     : 00000000`41414141 00000000`80002014 00000000`41414141 00000000`00000000 : nt!stricmp+0x9
ffffca0f`2802f760 fffff801`72ca806e     : ffffcf0c`89df45c0 00000000`00000000 00000000`000000c8 fffff801`780d4b41 : wsdkd+0x8de7
ffffca0f`2802f7a0 fffff801`77cd1f35     : ffffcf0c`89df45c0 00000000`00000004 00000000`00000002 00000000`00000001 : wsdkd+0x806e

Our security policy

We have reserved the ID CVE-2024-1241 to refer to this issue from now on.

Disclosure policy

System Information

Version: Watchdog Antivirus v1.6.415
Operating System: Windows

Mitigation

There is currently no patch available for this vulnerability.

References

Vendor page https://watchdog.dev/
Product page https://watchdog.dev/solutions/anti-virus/

Timeline



Vulnerability discovered

Feb 5, 2024



Vendor contacted

Feb 5, 2024



Vendor replied

Mar 3, 2024



Public disclosure

Apr 22, 2024

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