Vulnerability Name:

CVE-2022-24726 (CCN-221635)

Assigned:2022-03-10
Published:2022-03-10
Updated:2022-03-18
Summary: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](https://istio.io/latest/docs/setup/install/external-controlplane/) topologies, this port is exposed over the public internet. This issue has been patched in versions 1.13.2, 1.12.5 and 1.11.8. Users are advised to upgrade. Users unable to upgrade should disable access to a 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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-400
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2022-24726

Source: XF
Type: UNKNOWN
istio-cve202224726-dos(221635)

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://github.com/golang/go/issues/51112

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/istio/istio/commit/6ca5055a4db6695ef5504eabdfde3799f2ea91fd

Source: CCN
Type: Istio GIT Repository
Unauthenticated control plane denial of service attack due to stack exhaustion

Source: CONFIRM
Type: Issue Tracking, Third Party Advisory
https://github.com/istio/istio/security/advisories/GHSA-8w5h-qr4r-2h6g

Vulnerable Configuration:Configuration 1:
  • cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version < 1.11.8)
  • OR cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version >= 1.12.0 and < 1.12.5)
  • OR cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version >= 1.13.0 and < 1.13.2)

    • * Denotes that component is vulnerable
    BACK
    istio istio *
    istio istio *
    istio istio *