PT-2023-27936 · Calico · Calico Typha+1

Anthony Tam + 4 · Published 2023-11-06 · Updated 2023-11-14 · CVE-2023-41378

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Calico Typha versions 3.26.2 and below Calico Typha version 3.25.1 Calico Enterprise Typha versions 3.17.1 and below Calico Enterprise Typha version 3.16.3 Calico Enterprise Typha version 3.15.3

Description The issue arises when a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. This occurs because 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.

Recommendations For Calico Typha versions 3.26.2 and below, consider implementing a timeout for the TLS handshake to prevent indefinite blocking. For Calico Typha version 3.25.1, consider implementing a timeout for the TLS handshake to prevent indefinite blocking. For Calico Enterprise Typha versions 3.17.1 and below, consider implementing a timeout for the TLS handshake to prevent indefinite blocking. For Calico Enterprise Typha version 3.16.3, consider implementing a timeout for the TLS handshake to prevent indefinite blocking. For Calico Enterprise Typha version 3.15.3, consider implementing a timeout for the TLS handshake to prevent indefinite blocking.

Fix

Improper Handling of Exceptional Conditions

Resource Exhaustion

Weakness Enumeration

CWE-755

CWE-703

CWE-400

Related Identifiers

CVE-2023-41378

GHSA-5R5H-Q934-CCCP

Affected Products

Calico Enterprise Typha

Calico Typha

References · 9

• https://github.com/projectcalico/calico/pull/7993 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-41378 · Security Note
• https://tigera.io/security-bulletins-tta-2023-001 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-5r5h-q934-cccp · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-41378 · Vendor Advisory
• https://github.com/projectcalico/calico · Note
• https://github.com/projectcalico/calico/pull/7908 · Note
• https://github.com/projectcalico/calico/commit/2ebc1f92ecc39332cf1d55ba676d9101af24982f · Note
• https://github.com/projectcalico/calico/commit/ad8bd001e650ec7742ac30e58247e7eef5956125 · Note