PT-2023-27935 · Calico · Calico Typha+1
Published
2023-10-31
·
Updated
2023-11-01
·
CVE-2023-41377
None
No severity ratings or metrics are available. When they are, we'll update the corresponding info on the page.
Name of the Vulnerable Software and Affected Versions
Calico Typha versions 3.26.2 and below
Calico Enterprise Typha versions 3.17.1, 3.16.3, 3.15.3 and below
Description
In certain conditions, 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.Recommendations
For Calico Typha versions 3.26.2 and below, consider implementing a timeout for the
TLS Handshake() call to prevent indefinite blocking of the main loop.
For Calico Enterprise Typha versions 3.17.1, 3.16.3, 3.15.3 and below, consider implementing a timeout for the TLS Handshake() call to prevent indefinite blocking of the main loop.
As a temporary workaround, consider restricting access to the Calico Typha server to minimize the risk of exploitation. Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
Calico Enterprise Typha
Calico Typha