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checking the SID structure for TokenIntegrityLevel

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if the SID for TokenIntegrityLevel isn't the expected structure, GetSidSubAuthority might produce UB.
This commit is contained in:
Dani Kamanovsky
2024-11-03 15:43:31 +02:00
committed by GitHub
parent 9863ce4193
commit 73b18abe6f
1 changed files with 9 additions and 4 deletions
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utils.c
+9 -4
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@@ -41,6 +41,13 @@ BOOL CheckProcessIntegrityLevel() {
return FALSE;
}
if (pTIL->Label.Sid == NULL || *GetSidSubAuthorityCount(pTIL->Label.Sid) < 1) {
printf("[-] SID structure is invalid.\n");
LocalFree(pTIL);
CloseHandle(hToken);
return FALSE;
}
dwIntegrityLevel = *GetSidSubAuthority(pTIL->Label.Sid, (DWORD)(UCHAR)(*GetSidSubAuthorityCount(pTIL->Label.Sid) - 1));
if (dwIntegrityLevel >= SECURITY_MANDATORY_HIGH_RID) {
@@ -218,13 +225,11 @@ BOOL GetProviderGUIDByDescription(PCWSTR providerDescription, GUID* outProviderG
return FALSE;
}
BOOL found = FALSE;
for (UINT32 i = 0; i < numProviders; i++) {
if (providers[i]->displayData.description != NULL) {
if (wcscmp(providers[i]->displayData.description, providerDescription) == 0) {
*outProviderGUID = providers[i]->providerKey;
found = TRUE;
break;
return TRUE;
}
}
}
@@ -235,5 +240,5 @@ BOOL GetProviderGUIDByDescription(PCWSTR providerDescription, GUID* outProviderG
FwpmProviderDestroyEnumHandle0(hEngine, enumHandle);
FwpmEngineClose0(hEngine);
return found;
return FALSE;
}