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CVE-2023-45142

OpenTelemetry-Go Contrib vulnerable to denial of service in otelhttp due to unbound cardinality metrics

Summary

OpenTelemetry-Go Contrib vulnerable to denial of service in otelhttp due to unbound cardinality metrics

Original description

The description as published by the source.

Summary

This handler wrapper https://github.com/open-telemetry/opentelemetry-go-contrib/blob/5f7e6ad5a49b45df45f61a1deb29d7f1158032df/instrumentation/net/http/otelhttp/handler.go#L63-L65
out of the box adds labels

  • http.user_agent
  • http.method

that have unbound cardinality. It leads to the server's potential memory exhaustion when many malicious requests are sent to it.

Details

HTTP header User-Agent or HTTP method for requests can be easily set by an attacker to be random and long. The library internally uses httpconv.ServerRequest that records every value for HTTP method and User-Agent.

PoC

Send many requests with long randomly generated HTTP methods or/and User agents (e.g. a million) and observe how memory consumption increases during it.

Impact

In order to be affected, the program has to configure a metrics pipeline, use otelhttp.NewHandler wrapper, and does not filter any unknown HTTP methods or User agents on the level of…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Affected packages

Go go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]
Go go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]
Go go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]
Go go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]
Go go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]
Go go.opentelemetry.io/contrib/instrumentation/gopkg.in/macaron.v1/otelmacaron
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]
Go go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.44.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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