Varnish Cache/Enterprise HTTP/2 Broke Window Attack control flow

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Varnish Cache and Enterprise. It has been declared as problematic. This vulnerability affects unknown code of the component HTTP2 Handler. Executing a manipulation can lead to control flow. This vulnerability appears as CVE-2024-30156. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Varnish Cache and Enterprise (version now known). This vulnerability affects some unknown processing of the component HTTP2 Handler. The manipulation with an unknown input leads to a control flow vulnerability. The CWE definition for the vulnerability is CWE-670. The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated. As an impact it is known to affect availability. CVE summarizes:

Varnish Cache before 7.3.2 and 7.4.x before 7.4.3 (and before 6.0.13 LTS), and Varnish Enterprise 6 before 6.0.12r6, allows credits exhaustion for an HTTP/2 connection control flow window, aka a Broke Window Attack.

The advisory is shared for download at varnish-cache.org. This vulnerability was named CVE-2024-30156 since 03/24/2024. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 210477 (RHEL 8 : varnish:6 (RHSA-2024:4937)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (210477). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Control flow
CWE: CWE-670
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 210477
Nessus Name: RHEL 8 : varnish:6 (RHSA-2024:4937)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/24/2024 🔍
03/24/2024 +0 days 🔍
03/24/2024 +0 days 🔍
11/08/2024 +229 days 🔍

Sourcesinfo

Advisory: varnish-cache.org
Status: Confirmed

CVE: CVE-2024-30156 (🔍)
GCVE (CVE): GCVE-0-2024-30156
GCVE (VulDB): GCVE-100-257788

Entryinfo

Created: 03/24/2024 03:51
Updated: 11/08/2024 01:13
Changes: 03/24/2024 03:51 (52), 11/08/2024 01:13 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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