Vulnerability Name:

CVE-2020-16844 (CCN-189505)

Assigned:2020-08-11
Published:2020-08-11
Updated:2020-10-15
Summary:In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.
CVSS v3 Severity:6.8 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
5.9 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
6.8 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
5.9 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:N/AC:M/Au:S/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
6.6 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-16844

Source: XF
Type: UNKNOWN
istio-cve202016844-sec-bypass(189505)

Source: MISC
Type: Vendor Advisory
https://github.com/istio/istio/releases

Source: CCN
Type: ISTIO-SECURITY-2020-009
Istio

Source: CONFIRM
Type: Exploit, Mitigation, Vendor Advisory
https://istio.io/latest/news/security/istio-security-2020-009/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version >= 1.5.0 and <= 1.5.8)
  • OR cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version >= 1.6.0 and <= 1.6.7)

    • Configuration CCN 1:
  • cpe:/a:istio:istio:1.5.8:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.6.7:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    istio istio *
    istio istio *
    istio istio 1.5.8
    istio istio 1.6.7