Apple macOS up to 10.13.1 apache null pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2$0-$5k0.00

A vulnerability was found in Apple macOS up to 10.13.1 (Operating System). It has been rated as critical. This issue affects an unknown functionality of the component apache. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

A maliciously constructed HTTP/2 request could cause mod_http2 2.4.24, 2.4.25 to dereference a NULL pointer and crash the server process.

The bug was discovered 06/19/2017. The weakness was published 10/31/2017 by Robert Swiecki as HT208221 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. The identification of this vulnerability is CVE-2017-7659 since 04/11/2017. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful 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 24 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 101511 (Fedora 24 : httpd (2017-cf9599a306)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176075 (Debian Security Update for apache2 (DSA 3896-1)).

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 (101511). Similar entries are available at 104533, 108927, 108928 and 108929.

Productinfo

Type

Vendor

Name

Version

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

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 101511
Nessus Name: Fedora 24 : httpd (2017-cf9599a306)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801284
OpenVAS Name: Apache HTTP Server mod_http2 null pointer dereference DoS 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

04/11/2017 🔍
06/19/2017 +69 days 🔍
06/19/2017 +0 days 🔍
07/13/2017 +24 days 🔍
07/26/2017 +13 days 🔍
10/31/2017 +97 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-2017-7659 (🔍)
OVAL: 🔍

SecurityTracker: 1038711
SecurityFocus: 99132 - Apache HTTP Server CVE-2017-7659 Denial of Service Vulnerability

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

Entryinfo

Created: 11/03/2017 15:03
Updated: 01/21/2021 18:38
Changes: 11/03/2017 15:03 (81), 12/03/2019 09:09 (6), 01/21/2021 18:38 (2)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!