CVE-2017-17821
critical
CVSS v3
9.8
CVSS v2
7.5
VIR risk
9.8
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.
Predictions
Exploit likelihood
97%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2017-17821
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 2.22.0-2 |
| debian | bullseye | fixed | 2.22.0-2 |
| debian | forky | fixed | 2.22.0-2 |
| debian | sid | fixed | 2.22.0-2 |
| debian | trixie | fixed | 2.22.0-2 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| apple | safari | 46 | |
References
- https://bugs.webkit.org/show_bug.cgi?id=181020
- https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF.md
- https://security-tracker.debian.org/tracker/CVE-2017-17821
CWEs
CWE-119
Verify integrity in audit chain (admin only). AS-IS.