Microsoft Fixes a Security Failure in Windows Defender

Update immediately : Microsoft released an implicit update for a vulnerability that allowed remote execution στον μηχανισμό προστασίας κακόβουλου λογισμικού ( Protection Engine) used by the Windows security software, Windows Defender which is available by default in Windows 10.

It was discovered on May 12 by its well-known security researcher , Tavis Ormandy. The flaw was in the MsMpEng x86 emulator, and could be exploited by intruders with a tampered executable , mainly because it was not sandboxed.Windows Defender

"MsMpEng includes a full x86 emulator used to run any unreliable files that look like executable PE files. The emulator runs like NT AUTHORITY \ SYSTEM and is not sandboxed. "Looking through the list of win32 APIs that the emulator supports, I noticed ntdll! NtControlChannel, an ioctl-like routine that allows the emulated code to control the emulator," explains the security expert.

“Instruction 0x0C allows you to convert an attacker-controlled RegularExpressions to Microsoft GRETA (a library abandoned since the early 2000s) …Instruction 0x12 allows you to load additional microcode that can replace opcodes … Misc σας επιτρέπουν να αλλάξετε τις παραμέτρους εκτέλεσης Και να διαβάσετε τα χαρακτηριστικά σάρωσης και τα μετα of UFS. This at least looks like a privacy leak, as an attacker can look for the research attributes you set and then retrieve them through the scan results.”

Ormandy calls the security flaw a “potentially extremely malicious vulnerability.” The researcher reported this new vulnerability to Microsoft privately, and the company rolled out a fix for Windows Defender last week. To stay protected, you should have automatic updates turned on and run the latest version of Windows Defender.

Microsoft has not yet issued a formal statement on the issue.

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Written by giorgos

George still wonders what he's doing here ...

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