Server memory exhaustion via unbounded HTTP-method metrics
Published Oct 6, 2023 · Updated Sep 19, 2024
Uncontrolled resource consumption in OpenTelemetry Python Contrib before 0.41b0 allows remote attackers to exhaust server memory. WSGI instrumentation copies each unrecognized request method into the http.method metric label, creating a distinct time series for every attacker-chosen value. Exposure requires an instrumented HTTP handler and no CDN, load balancer, or earlier middleware that rejects unknown methods; repeated long, random methods can interrupt the server through memory exhaustion.
Summary
What happened
Uncontrolled resource consumption in OpenTelemetry Python Contrib before 0.41b0 allows remote attackers to exhaust server memory. WSGI instrumentation copies each unrecognized request method into the http.method metric label, creating a distinct time series for every attacker-chosen value. Exposure requires an instrumented HTTP handler and no CDN, load balancer, or earlier middleware that rejects unknown methods; repeated long, random methods can interrupt the server through memory exhaustion.
The record
- CVE
- CVE-2023-43810
- Published
- Oct 6, 2023
- Updated
- Sep 19, 2024
- Vendor
- OpenTelemetry
- Product
- OpenTelemetry Python Contrib
- Classifications
- CWE-400, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 6, 2023CVE publishedPublication date reported by the CVE source.
- Sep 19, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.41b0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Long random HTTP-method memory-exhaustion proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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