Vulnerability CVE-2017-17821

Vulnerability Name:

CVE-2017-17821 (CCN-136451)

Assigned:

2017-12-20

Published:

2017-12-20

Updated:

2018-01-10

Summary:

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 v3 Severity:

9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.9 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:R)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:U/RC:R)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

CVSS v2 Severity:

7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

Vulnerability Type:

CWE-119

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2017-17821

Source: MISC
Type: Permissions Required
https://bugs.webkit.org/show_bug.cgi?id=181020

Source: CCN
Type: Apple Inc Web site
Safari Technology Preview - Safari for Developers - Apple Developer

Source: XF
Type: UNKNOWN
Safari-webkit-cve201717821-dos(136451)

Source: CCN
Type: WebKit GIT Repository
WebKit Misuse of WTF/wtf/FastBitVector result in potential BOF

Source: MISC
Type: Third Party Advisory
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

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2017-17821

Vulnerable Configuration:

Configuration 1:

cpe:/a:apple:safari:46:*:*:*:technology_preview:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.xenial:def:2017178210000000	V	CVE-2017-17821 on Ubuntu 16.04 LTS (xenial) - medium.	2017-12-21
oval:com.ubuntu.disco:def:2017178210000000	V	CVE-2017-17821 on Ubuntu 19.04 (disco) - medium.	2017-12-21
oval:com.ubuntu.bionic:def:2017178210000000	V	CVE-2017-17821 on Ubuntu 18.04 LTS (bionic) - medium.	2017-12-21
oval:com.ubuntu.artful:def:201717821000	V	CVE-2017-17821 on Ubuntu 17.10 (artful) - medium.	2017-12-20
oval:com.ubuntu.xenial:def:201717821000	V	CVE-2017-17821 on Ubuntu 16.04 LTS (xenial) - medium.	2017-12-20
oval:com.ubuntu.bionic:def:201717821000	V	CVE-2017-17821 on Ubuntu 18.04 LTS (bionic) - medium.	2017-12-20
oval:com.ubuntu.cosmic:def:2017178210000000	V	CVE-2017-17821 on Ubuntu 18.10 (cosmic) - medium.	2017-12-20
oval:com.ubuntu.cosmic:def:201717821000	V	CVE-2017-17821 on Ubuntu 18.10 (cosmic) - medium.	2017-12-20
oval:com.ubuntu.trusty:def:201717821000	V	CVE-2017-17821 on Ubuntu 14.04 LTS (trusty) - medium.	2017-12-20

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