CVE-2021-31232: Improper Input Validation

April 30, 2021 (updated August 8, 2023)

The Alertmanager in CNCF Cortex has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. The alertmanager templates can be used as an attack vector to send any file content because the alertmanager can load any text file specified in the templates list.

References

lists.cncf.io/g/cortex-users/message/50
nvd.nist.gov/vuln/detail/CVE-2021-31232

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