Apache HTTP Server up to 2.4.34 SETTINGS Frame input validation

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.
4.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Apache HTTP Server up to 2.4.34. This issue affects some unknown processing of the component SETTINGS Frame Handler. This manipulation causes input validation. This vulnerability is tracked as CVE-2018-11763. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Apache HTTP Server up to 2.4.34 (Web Server) and classified as problematic. Affected by this vulnerability is an unknown functionality of the component SETTINGS Frame Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.

The bug was discovered 09/25/2018. The weakness was disclosed 09/25/2018 (Website). It is possible to read the advisory at httpd.apache.org. This vulnerability is known as CVE-2018-11763 since 06/05/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 117807 (Apache 2.4.x < 2.4.35 DoS), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197269 (Ubuntu Security Notification for Apache2 Vulnerabilities (USN-3783-1)).

Upgrading 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 (117807) and SecurityFocus (BID 105414†). The entries VDB-103521, VDB-108939, VDB-110393 and VDB-115057 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 117807
Nessus Name: Apache 2.4.x < 2.4.35 DoS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Timelineinfo

06/05/2018 🔍
09/25/2018 +112 days 🔍
09/25/2018 +0 days 🔍
09/25/2018 +0 days 🔍
09/25/2018 +0 days 🔍
09/25/2018 +0 days 🔍
09/26/2018 +1 days 🔍
09/27/2018 +1 days 🔍
05/17/2023 +1693 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: RHSA-2018:3558
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-11763 (🔍)
GCVE (CVE): GCVE-0-2018-11763
GCVE (VulDB): GCVE-100-124447
SecurityFocus: 105414 - Apache HTTP Server CVE-2018-11763 Denial of Service Vulnerability
SecurityTracker: 1041713

See also: 🔍

Entryinfo

Created: 09/26/2018 07:30
Updated: 05/17/2023 19:19
Changes: 09/26/2018 07:30 (67), 09/28/2018 07:49 (1), 03/27/2020 08:29 (6), 05/17/2023 19:19 (8)
Complete: 🔍
Committer: gomesj
Cache ID: 216:818:103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!