CVE-2026-42602— azureauthextension Authenticate method does not validate bearer tokens, allowing auth bypass via replay

azureauthextension Authenticate method does not validate bearer tokens, allowing auth bypass via replay

azureauthextension is the Azure Authenticator Extension. From 0.124.0 to 0.150.0, a server-side authentication bypass in azureauthextension allows any party who holds a single valid Azure access token for any scope the collector's configured identity can mint for to authenticate to any OpenTelemetry receiver that uses auth: azure_auth. The extension's Authenticate method does not validate incoming bearer tokens as JWTs. Instead, it calls its own configured credential to obtain an access token and compares the client's token to the result with string equality — and the scope for that server-side token request is taken from the client-supplied Host header. As a result, a token minted for any Azure resource the service principal has ever been issued a token for (ARM, Graph, Key Vault, Storage, etc.) will authenticate to the collector if the attacker picks a matching Host. Tokens are replayable for the full issued lifetime (commonly several hours for managed identity tokens).

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

通过时间差异性导致的信息暴露

OpenTelemetry Collector Contrib 安全漏洞

OpenTelemetry Collector Contrib是OpenTelemetry - CNCF开源的一个可扩展的遥测数据采集组件库。 OpenTelemetry Collector Contrib 0.124.0版本至0.150.0版本存在安全漏洞，该漏洞源于Authenticate方法未验证传入的Bearer令牌为JWT，可能导致服务器端身份验证绕过。

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