Apple Safari up to 10.1.0 WebKit JSObject::ensureLength ensureLengthSlow memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Apple Safari up to 10.1.0. It has been declared as critical. The affected element is the function JSObject::ensureLength of the component WebKit. Executing a manipulation of the argument ensureLengthSlow can lead to memory corruption. This vulnerability appears as CVE-2017-2521. The attack may be performed from remote. In addition, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apple Safari up to 10.1.0 (Web Browser). It has been declared as critical. This vulnerability affects the function JSObject::ensureLength of the component WebKit. The manipulation of the argument ensureLengthSlow with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 05/10/2017. The weakness was presented 05/15/2017 by lokihardt with Google Project Zero as HT207804 as confirmed advisory (Website). The advisory is available at support.apple.com. This vulnerability was named CVE-2017-2521 since 12/01/2016. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details and also a public exploit are known. The advisory points out:

Multiple memory corruption issues were addressed with improved memory handling.

A public exploit has been developed by Google Security Research and been published 3 weeks after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 100256 (Apple TV < 10.2.1 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371242 (Apple Safari 10.1.1 Not Installed (APPLE-SA-2017-05-15-7)).

Upgrading to version 10.1.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (42103), Tenable (100256) and SecurityFocus (BID 98456†). See VDB-101294, VDB-101254, VDB-101262 and VDB-101263 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.2

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Google Security Research
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100256
Nessus Name: Apple TV < 10.2.1 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802925
OpenVAS Name: Apple Safari Multiple Vulnerabilities-HT207804
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Exploit Delay Time: 🔍

Upgrade: Safari 10.1.1

Timelineinfo

12/01/2016 🔍
05/10/2017 +160 days 🔍
05/15/2017 +5 days 🔍
05/15/2017 +0 days 🔍
05/15/2017 +0 days 🔍
05/16/2017 +1 days 🔍
05/17/2017 +1 days 🔍
05/22/2017 +5 days 🔍
06/01/2017 +10 days 🔍
06/01/2017 +0 days 🔍
12/24/2024 +2763 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT207804
Researcher: lokihardt (lokihardt)
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-2521 (🔍)
GCVE (CVE): GCVE-0-2017-2521
GCVE (VulDB): GCVE-100-101338
SecurityFocus: 98456 - WebKit CVE-2017-2521 Unspecified Memory Corruption Vulnerability
SecurityTracker: 1038487

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/16/2017 09:16
Updated: 12/24/2024 13:29
Changes: 05/16/2017 09:16 (89), 10/13/2019 10:17 (6), 12/24/2020 09:00 (3), 12/24/2020 09:02 (1), 12/24/2024 13:29 (15)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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