CVE-2017-17821 — CRITICAL (9.8)

Vulnerability 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 Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Apple	Safari	46

Related Weaknesses (CWE)

CWE-119

References

https://bugs.webkit.org/show_bug.cgi?id=181020Permissions Required
https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBThird Party Advisory
https://bugs.webkit.org/show_bug.cgi?id=181020Permissions Required
https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBThird Party Advisory

FAQ

What is CVE-2017-17821?

CVE-2017-17821 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 imp...

How severe is CVE-2017-17821?

CVE-2017-17821 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2017-17821?

Check the references section above for vendor advisories and patch information. Affected products include: Apple Safari.