Uncontrolled Resource Consumption ('Resource Exhaustion') Affecting envoyproxy/envoy package, versions [,1.26.8) [1.27.0,1.27.4) [1.28.0, 1.28.2) [1.29.0, 1.29.3)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    EPSS
    0.05% (16th percentile)

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  • Snyk ID SNYK-UNMANAGED-ENVOYPROXYENVOY-6531318
  • published 4 Apr 2024
  • disclosed 3 Apr 2024
  • credit Unknown

How to fix?

Upgrade envoyproxy/envoy to version 1.26.8, 1.27.4, 1.28.2, 1.29.3 or higher.

Overview

Affected versions of this package are vulnerable to Uncontrolled Resource Consumption ('Resource Exhaustion') due to insufficient limitations on the amount of CONTINUATION frames that can be sent within a single stream. An attacker can send a sequence of CONTINUATION frames without the END_HEADERS bit set, causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

CVSS Scores

version 3.1
Expand this section

Snyk

5.3 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    Low