Apple macOS up to 10.13.1 CFString Memory information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

A vulnerability classified as problematic has been found in Apple macOS up to 10.13.1 (Operating System). This affects an unknown code of the component CFString. The manipulation with an unknown input leads to a information disclosure vulnerability (Memory). CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

An issue was discovered in certain Apple products. macOS before 10.13.1 is affected. The issue involves the "CFString" component. It allows attackers to bypass intended memory-read restrictions via a crafted app.

The bug was discovered 10/31/2017. The weakness was published 10/31/2017 as HT208221 as confirmed advisory (Website). The advisory is shared at support.apple.com. This vulnerability is uniquely identified as CVE-2017-13821 since 08/30/2017. An attack has to be approached locally. A authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue. The advisory points out:

A validation issue was addressed with improved input sanitization.

The vulnerability scanner Nessus provides a plugin with the ID 103598 (macOS < 10.13 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370625 (Apple macOS High Sierra 10.13.1, Security Update 2017-001 Sierra, and Security Update 2017-004 El Capitan Not Installed).

Upgrading to version 10.13.1 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 Tenable (103598) and SecurityFocus (BID 91816†). Similar entries are available at VDB-89669, VDB-89849, VDB-98603 and VDB-99763.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Name: Memory
Class: Information disclosure / Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

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Nessus ID: 103598
Nessus Name: macOS < 10.13 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 861083
OpenVAS Name: Apple MacOSX Multiple Code Execution Vulnerabilities HT208221
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: macOS 10.13.1

Timelineinfo

07/18/2016 🔍
08/30/2017 +408 days 🔍
10/03/2017 +34 days 🔍
10/31/2017 +28 days 🔍
10/31/2017 +0 days 🔍
10/31/2017 +0 days 🔍
11/03/2017 +3 days 🔍
11/12/2017 +9 days 🔍
09/04/2024 +2488 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT208221
Researcher: Scott Geary
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-13821 (🔍)
SecurityFocus: 91816
SecurityTracker: 1039710

scip Labs: https://www.scip.ch/en/?labs.20180712
See also: 🔍

Entryinfo

Created: 11/03/2017 03:11 PM
Updated: 09/04/2024 05:38 PM
Changes: 11/03/2017 03:11 PM (77), 12/03/2019 10:05 AM (4), 01/21/2021 07:49 PM (2), 01/21/2021 07:51 PM (3), 09/04/2024 05:38 PM (17)
Complete: 🔍
Cache ID: 18:2A4:40

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