CVE-2024-31309
Published: 10 April 2024
Summary
CVE-2024-31309 is a high-severity Improper Input Validation (CWE-20) vulnerability in Fedoraproject Fedora. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Service Exhaustion Flood (T1499.002); ranked in the top 6.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2024-31309 is a denial-of-service vulnerability in Apache Traffic Server that stems from insufficient limits on HTTP/2 CONTINUATION frames. It affects versions 8.0.0 through 8.1.9 and 9.0.0 through 9.2.3, allowing an attacker to trigger excessive resource consumption on the server.
An unauthenticated remote attacker can send a crafted stream of CONTINUATION frames over HTTP/2 to exhaust server resources and degrade availability, corresponding to the CVSS 7.5 rating with a high impact on availability.
Advisories recommend upgrading to fixed releases 8.1.10 or 9.2.4; as a workaround, operators can configure the new setting proxy.config.http2.max_continuation_frames_per_minute to cap the number of such frames processed per minute. The EPSS score has remained flat at 0.1085 with no material increase after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-29205
Vulnerability details
HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server. Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected. Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION…
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frames per minute. ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE-2024-31309 enables a denial-of-service attack on Apache Traffic Server by flooding HTTP/2 CONTINUATION frames, exhausting server CPU/memory resources, directly facilitating Service Exhaustion Flood.
MITRE ATLAS TechniquesAI
MITRE ATLAS techniques
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Security testing and developer training directly verify and enforce proper input validation, reducing exploitability of injection and malformed-data weaknesses.
Security testing and evaluation at multiple SDLC stages directly detects missing or flawed input validation, with the required remediation process ensuring fixes are applied.
Directly implements checks on information inputs to reject invalid data before processing.
Spam protection mechanisms perform filtering and detection on inbound/outbound messages, directly compensating for missing or weak input validation of unsolicited content.