Microsoft File Checksum Integrity Verifier 2.05 DLL Loader fciv.exe privileges management

Summaryinfo

A vulnerability classified as critical was found in Microsoft File Checksum Integrity Verifier 2.05. Affected is an unknown function of the file fciv.exe of the component DLL Loader. The manipulation results in privileges management. Attacking locally is a requirement. Furthermore, an exploit is available.

Detailsinfo

A vulnerability was found in Microsoft File Checksum Integrity Verifier 2.05. It has been classified as critical. Affected is an unknown function of the file fciv.exe of the component DLL Loader. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 07/04/2019 by John Page (hyp3rlinx) as not defined advisory (Website). The advisory is available at hyp3rlinx.altervista.org. Local access is required to approach this attack. The successful exploitation requires a authentication. Technical details and a public exploit are known. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The exploit is shared for download at hyp3rlinx.altervista.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 31 days. During that time the estimated underground price was around $5k-$25k. The code used by the exploit is:

"evil.c"

#include <windows.h>
//gcc -shared -o cryptsp.dll evil.c

void evilo(void){
WinExec("calc", 0);
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved){
evilo();
return 0;
}

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Microsoft

Name

• File Checksum Integrity Verifier

Version

• 2.05

License

• commercial

Website

• Vendor: https://www.microsoft.com/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Submitinfo

Accepted

• Submit #75: Microsoft File Checksum Integrity Verifier "fciv.exe" v2.05 Trojan File Arbitrary Code Execution (by hyp3rlinx)

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