Apple Safari 10.0.3 on MacOS JSC::CachedCall access control

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 10.0.3 on MacOS. It has been rated as critical. This issue affects the function JSC::CachedCall. Performing a manipulation results in access control. This vulnerability was named CVE-2017-2491. The attack may be initiated remotely. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Apple Safari 10.0.3 on MacOS (Web Browser). This affects the function JSC::CachedCall. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Use after free vulnerability in the String.replace method JavaScriptCore in Apple Safari in iOS before 10.3 allows remote attackers to execute arbitrary code via a crafted web page, or a crafted file.

The bug was discovered 03/17/2017. The weakness was presented 05/04/2017 as ZDI-17-231 as confirmed exploit (Exploit-DB). It is possible to read the advisory at exploit-db.com. This vulnerability is uniquely identified as CVE-2017-2491 since 12/01/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details and a public exploit are known. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

The WebKit bug we used at Pwn2Own is CVE-2017-2491 / ZDI-17-231, a use-after-free of a JSString object in JavaScriptCore. By triggering it, we can obtain a dangling pointer to a JSString object in a JavaScript callback. At first, the specific scenario seems very hard to exploit, but we found a rather generic technique to still get a reliable read/write primitive out of it, although it requires a very large (~28 GiB) heap spray. This is possible even on a MacBook with 8 GB of RAM thanks to the page compression mechanism in macOS.

A public exploit has been developed by saelo/niklasb in Javascript and been published immediately after the advisory. The exploit is shared for download 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 10 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 99264 (Apple TV < 10.2 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.

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41964), Tenable (99264) and SecurityFocus (BID 98316†). See VDB-98613, VDB-98614, VDB-98618 and VDB-98623 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

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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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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: saelo/niklasb
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 99264
Nessus Name: Apple TV < 10.2 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

12/01/2016 🔍
03/17/2017 +106 days 🔍
03/27/2017 +10 days 🔍
04/10/2017 +14 days 🔍
05/04/2017 +24 days 🔍
05/04/2017 +0 days 🔍
05/04/2017 +0 days 🔍
05/04/2017 +0 days 🔍
05/05/2017 +1 days 🔍
06/27/2017 +53 days 🔍
01/24/2025 +2768 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: ZDI-17-231
Researcher: Samuel Gro??, Niklas Baumstark.
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-2491 (🔍)
GCVE (CVE): GCVE-0-2017-2491
GCVE (VulDB): GCVE-100-100863
SecurityFocus: 98316 - Apple Safari CVE-2017-2491 Use After Free Remote Code Execution Vulnerability
OSVDB: - CVE-2017-2491 - Apple - Iphone Os - Medium

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

Entryinfo

Created: 05/05/2017 09:17
Updated: 01/24/2025 11:17
Changes: 05/05/2017 09:17 (80), 09/23/2020 22:23 (8), 12/22/2020 12:58 (3), 01/24/2025 11:17 (15)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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