PT-2022-16833 · Istio · Istio
Howardjohn
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Published
2022-03-10
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Updated
2022-03-18
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CVE-2022-24726
CVSS v3.1
7.5
High
| 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
Istio versions prior to 1.11.8
Istio versions prior to 1.12.5
Istio versions prior to 1.13.2
Description
Istio is an open platform to connect, manage, and secure microservices. In affected versions, the Istio control plane, istiod, is vulnerable to a request processing error, allowing a malicious attacker that sends a specially crafted message which results in the control plane crashing when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017, but does not require any authentication from the attacker. For simple installations, Istiod is typically only reachable from within the cluster, limiting the blast radius. However, for some deployments, especially external istiod topologies, this port is exposed over the public internet.
Recommendations
For versions prior to 1.11.8, upgrade to version 1.11.8 or later.
For versions prior to 1.12.5, upgrade to version 1.12.5 or later.
For versions prior to 1.13.2, upgrade to version 1.13.2 or later.
As a temporary workaround, consider disabling access to the validating webhook that is exposed to the public internet or restrict the set of IP addresses that can query it to a set of known, trusted entities.
Exploit
Fix
Resource Exhaustion
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Weakness Enumeration
Related Identifiers
Affected Products
Istio