CVE-2017-17821 Information

Description

WTF/wtf/FastBitVector.h in WebKit as distributed in Safari Technology Preview Release 46 allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size and resizeSlow mishandles cases where the old array length is greater than the new array length.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://bugs.webkit.org/show_bug.cgi?id=181020 https://github.com/dwfault/PoCs/blob/master/WebKit20Misuse20of20WTF:wtf:FastBitVector20result20in20potential20BOF/WebKit20Misuse20of20WTF:wtf:FastBitVector20result20in20potential20BOF.md

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8