Cyber Resilience

CVE-2023-41378

HighDDoS

Published: 06 November 2023

Published
06 November 2023
Modified
21 November 2024
KEV Added
Patch
CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0022 45.3th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2023-41378 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Tigera Calico Enterprise. Its CVSS base score is 7.5 (High).

Operationally, ranked at the 45.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is…

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performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.

CWE(s)

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

tigera
calico cloud
≤ 18.0.0
tigera
calico enterprise
≤ 3.15.4 · 3.16.0 — 3.16.4 · 3.17.0 — 3.17.2
tigera
calico os
≤ 3.25.2 · 3.26.0 — 3.26.3

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.

Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.

MTTF monitoring plus ready substitutes directly mitigate sustained resource exhaustion by allowing component swap before or at failure.

addresses: CWE-703 CWE-755

Implements explicit check and handling for the exceptional condition of audit logging process failure.

addresses: CWE-703 CWE-755

Provides a defined response to detected conditions by restricting operation, ensuring exceptional conditions are handled rather than ignored or mishandled.

addresses: CWE-703 CWE-755

Contingency training equips users with defined procedures to check and respond to exceptional conditions during disruptions, reducing exploitation of mishandled errors.

addresses: CWE-400 CWE-703

Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.

addresses: CWE-703 CWE-755

Policy defines checks and handling for exceptional conditions arising from security incidents.

addresses: CWE-703 CWE-755

Performing IR tests ensures exceptional conditions are properly checked and handled to enable effective response.

References