7.5
HIGH
CVE-2024-27919
Envoy CONTINUATION Frame Flood Denial of Service Vulnerability
Description

Envoy is a cloud-native, open-source edge and service proxy. In versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround, downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.

INFO

Published Date :

April 4, 2024, 3:15 p.m.

Last Modified :

Nov. 21, 2024, 9:05 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2024-27919 has a 5 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2024-27919 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Envoyproxy envoy

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Proof of concept (PoC) for CVE-2024-27316 (tested), CVE-2024-30255 (untested), CVE-2024-31309 (untested), CVE-2024-28182 (untested), CVE-2024-2653 (untested) and CVE-2024-27919 (untested)

cve-2024-2653 cve-2024-27316 cve-2024-27919 cve-2024-28182 cve-2024-30255 cve-2024-31309

Go

Updated: 2 weeks, 3 days ago
13 stars 2 fork 2 watcher
Born at : April 9, 2024, 8:08 a.m. This repo has been linked 6 different CVEs too.

A proof of concept for CVE-2024-27316 (tested), CVE-2024-31309 (untested), CVE-2024-30255 (untested), CVE-2024-28182 (untested), CVE-2024-2653 (untested) and CVE-2024-27919 (untested)

Updated: 8 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : April 9, 2024, 7:56 a.m. This repo has been linked 5 different CVEs too.

PoC HTTP/2 Continuation Flood DOS Attack

Python

Updated: 7 months ago
2 stars 0 fork 0 watcher
Born at : April 7, 2024, 2:31 p.m. This repo has been linked 9 different CVEs too.

Proof of Concept: HTTP/2 CONTINUATION Flood

http2 poc proof-of-concept vulnerability http2-continuation-flood

Python Dockerfile Go

Updated: 2 months ago
8 stars 2 fork 2 watcher
Born at : April 6, 2024, 3:34 p.m. This repo has been linked 9 different CVEs too.

This repo showcases a proof of concept for HTTP/2 CONTINUATION Flood vulnerabilities, allowing testing and understanding of potential DoS attacks on servers due to protocol implementation flaws. Includes code, documentation, and CVE mapping.

Python

Updated: 8 months, 1 week ago
4 stars 0 fork 0 watcher
Born at : April 5, 2024, 10:09 p.m. This repo has been linked 9 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2024-27919 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2024-27919 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2024/04/03/16
    Added Reference http://www.openwall.com/lists/oss-security/2024/04/05/3
    Added Reference https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5
    Added Reference https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    May. 01, 2024

    Action Type Old Value New Value
    Added Reference GitHub, Inc. http://www.openwall.com/lists/oss-security/2024/04/05/3 [No types assigned]
    Added Reference GitHub, Inc. http://www.openwall.com/lists/oss-security/2024/04/03/16 [No types assigned]
  • CVE Received by [email protected]

    Apr. 04, 2024

    Action Type Old Value New Value
    Added Description Envoy is a cloud-native, open-source edge and service proxy. In versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround, downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.
    Added Reference GitHub, Inc. https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r [No types assigned]
    Added Reference GitHub, Inc. https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5 [No types assigned]
    Added CWE GitHub, Inc. CWE-390
    Added CVSS V3.1 GitHub, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2024-27919 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2024-27919 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability