Windows 0-day pops up out of (nowhere) Twitter
Windows 0-day pops up out of nowhere Twitter
Local privilege escalation in procedure calls
It's not bad enough to take Microsoft out-of-cycle, but CERT/CC has just put out a warning of a new privilege escalation bug in Windows.
According to the Tweet that set the hounds running, it's a zero-day with a proof-of-concept at GitHub.
CERT/CC vulnerability analyst Phil Dormann quickly verified the bug, Tweeting: “I've confirmed that this works well in a fully-patched 64-bit Windows 10 system. LPE right to SYSTEM!” (LPE – local privilege escalation – El Reg).
CERT/CC has finished its more formal investigation, and has just posteda vulnerability note.
“Microsoft Windows task scheduler contains a vulnerability in the handling of ALPC, which can allow a local user to gain SYSTEM privileges”, the advisory stated.
ALPC, Advanced Local Procedure Call, restricts the impact somewhat, since it's a local bug.
However, it opens an all-too-familiar attack vector: if an attacker can get a target to download and run an app, local privilege escalation gets the malware out of the user context up to (in this case) system privilege. Ouch.
The vulnerability note says: “The CERT/CC is currently unaware of a practical solution to this problem.”
Responding to The Register's e-mail inquiry, a Microsoft spokesperson it will “proactively update impacted advices as soon as possible”, and pointed to its Update Tuesday schedule.
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