Update immediately windows Defender: Microsoft released an implicit update for a vulnerability that allowed remote execution code στον μηχανισμό προστασίας κακόβουλου λογισμικού (Malware 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 google project zero, Tavis Ormandy. The flaw was in the MsMpEng x86 emulator, and could be exploited by intruders with a tampered executable archive, mainly because it was not sandboxed.
"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 commands σας επιτρέπουν να αλλάξετε τις παραμέτρους εκτέλεσης Και να διαβάσετε τα χαρακτηριστικά σάρωσης και τα μεταdata 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 weekteam. 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.