Apple macOS up to 10.13.1 apache use after free

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

A vulnerability, which was classified as critical, was found in Apple macOS up to 10.13.1 (Operating System). This affects an unknown code block of the component apache. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability. The summary by CVE is:

When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.

The bug was discovered 07/11/2017. The weakness was shared 10/31/2017 by Robert Swiecki as HT208221 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. This vulnerability is uniquely identified as CVE-2017-9789 since 06/21/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The advisory points out:

Multiple issues were addressed by updating to version 2.4.27.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 101540 (FreeBSD : Apache httpd -- multiple vulnerabilities (457ce015-67fa-11e7-867f-b499baebfeaf)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. 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 vulnerability database at Tenable (101540). The entries 103521, 108927, 108928 and 108929 are related to this item.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101540
Nessus Name: FreeBSD : Apache httpd -- multiple vulnerabilities (457ce015-67fa-11e7-867f-b499baebfeaf)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800837
OpenVAS Name: Apache HTTP Server mod_http2 Denial-Of-Service Vulnerability (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: macOS 10.13.1

Timelineinfo

06/21/2017 🔍
07/11/2017 +20 days 🔍
07/13/2017 +2 days 🔍
07/13/2017 +0 days 🔍
07/14/2017 +1 days 🔍
10/31/2017 +109 days 🔍
10/31/2017 +0 days 🔍
11/03/2017 +3 days 🔍
01/21/2021 +1175 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT208221
Researcher: Robert Swiecki
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-9789 (🔍)
SecurityTracker: 1038907
SecurityFocus: 99568 - Apache HTTP Server CVE-2017-9789 Denial of Service Vulnerability

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

Entryinfo

Created: 11/03/2017 15:04
Updated: 01/21/2021 19:01
Changes: 11/03/2017 15:04 (80), 12/03/2019 09:32 (6), 01/21/2021 19:01 (2)
Complete: 🔍

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