6.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-42368

CVE-2024-42368: open-telemetry has an Observable Timing Discrepancy

Summary

The bearertokenauth extension's server authenticator performs a simple, non-constant time string comparison of the received & configured bearer tokens.

Details

https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/9128a9258fe1fee36f198f97b1e3371fc7b77a93/extension/bearertokenauthextension/bearertokenauth.go#L189-L196

For background on the type of vulnerability, see https://ropesec.com/articles/timing-attacks/.

Impact

This impacts anyone using the bearertokenauth server authenticator. Malicious clients with network access to the collector may perform a timing attack against a collector with this authenticator to guess the configured token, by iteratively sending tokens and comparing the response time. This would allow an attacker to introduce fabricated or bad data into the collector's telemetry pipeline.

Fix

The observable timing vulnerability was fixed by @axw in v0.107.0 (PR https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/34516) by using constant-time comparison.

Workarounds

upgrade to v0.107.0 or above, or, if you're unable to upgrade at this time,
don't expose the receiver using bearertokenauth to network segments accessible by potential attackers, or
change the receiver to use a different authentication extension instead, or
disable the receiver relying on bearertokenauth

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-42368

CVE-2024-42368:

6.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/open-telemetry/opentelemetry-collector-contrib/extension/bearertokenauthextension	go	>= 0.80.0, < 0.107.0	0.107.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from line 189-196 in bearertokenauth.go where token comparison was done using regular string equality check (expect != token). The commit c9bd3eff0bb357d9c812a0d8defd3b09db95699a replaced this with crypto/subtle.ConstantTimeCompare. The Authenticate method handles server-side token validation, making it the critical point where timing discrepancies could be exploited. The pre-patch code clearly shows a vulnerable comparison pattern while the fix explicitly addresses it with constant-time comparison.

Vulnerable functions

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WAF Rule

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Reasoning

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