Vulnerability Name:

CVE-2020-8561 (CCN-209532)

Assigned:2020-02-03
Published:2021-09-15
Updated:2021-11-06
Summary:A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.
CVSS v3 Severity:4.1 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N)
3.6 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
2.7 Low (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N)
2.4 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-610
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2020-8561

Source: XF
Type: UNKNOWN
kubernetes-cve20208561-info-disc(209532)

Source: CCN
Type: kubernetes GIT Repository
CVE-2020-8561: Webhook redirect in kube-apiserver #104720

Source: CONFIRM
Type: Mitigation, Third Party Advisory
N/A

Source: MLIST
Type: Mailing List, Mitigation
N/A

Source: CCN
Type: oss-sec Mailing List, Wed, 15 Sep 2021 21:21:53 +0000
[kubernetes] CVE-2020-8561: Webhook redirect in kube-apiserver

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20211014-0002/

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-8561

Vulnerable Configuration:Configuration 1:
  • cpe:/a:kubernetes:kubernetes:1.20.11:-:*:*:*:*:*:*
  • OR cpe:/a:kubernetes:kubernetes:1.21.5:-:*:*:*:*:*:*
  • OR cpe:/a:kubernetes:kubernetes:1.22.2:-:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/a:kubernetes:kubernetes:-:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    kubernetes kubernetes 1.20.11 -
    kubernetes kubernetes 1.21.5 -
    kubernetes kubernetes 1.22.2 -
    kubernetes kubernetes -