Denial of Service (DoS) Affecting github.com/prometheus/client_golang/prometheus/promhttp package, versions <1.11.1
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Test your applications- Snyk ID SNYK-GOLANG-GITHUBCOMPROMETHEUSCLIENTGOLANGPROMETHEUSPROMHTTP-2401819
- published 16 Feb 2022
- disclosed 15 Feb 2022
- credit Unknown
Introduced: 15 Feb 2022
CVE-2022-21698 Open this link in a new tabHow to fix?
Upgrade github.com/prometheus/client_golang/prometheus/promhttp
to version 1.11.1 or higher.
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS) when handling requests with non-standard HTTP methods.
Note: In order to be affected, an instrumented software must:
use
promhttp.InstrumentHandler*
middleware exceptRequestsInFlight
not filter any specific methods (e.g GET) before middleware
pass metric with
method
label name to the middlewarenot have any firewall/LB/proxy that filters away requests with unknown
method
.
Workarounds:
removing the
method
label name fromcounter/gauge
used in theInstrumentHandler
turning off affected
promhttp
handlersadding custom middleware before
promhttp
handler that will sanitize the request method given by Gohttp.Request
using a reverse proxy or web application firewall, configured to only allow a limited set of methods.
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