Vulnerability · Published Nov 6, 2023 · Assigned by Tigera

CVE-2023-41378Calico Typha hangs during unclean TLS handshake

High 7.5

In plain English

A high-severity uncontrolled resource consumption in Typha from Calico. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.7%top 45.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/projectcalico/calico	3.26.3	GHSA-5r5h-q934-cccp
Go	github.com/projectcalico/calico	no fix listed	GHSA-5r5h-q934-cccp

Affected products (as reported)

Vendor	Product	Versions
Calico	Typha	v3.26.0 – through v3.26.20 – through v3.25.1
Tigera	Typha	v3.17.0 – through v3.17.1v3.16.0 – through v3.16.30 – through v3.15.3

Weakness: CWE-400, CWE-703 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://www.tigera.io/security-bulletins-tta-2023-001/ vendor-advisory, release-notes
https://github.com/projectcalico/calico/pull/7908 issue-tracking
https://github.com/projectcalico/calico/pull/7993 patch