Vulnerability Name:

CVE-2021-31920 (CCN-202710)

Assigned:2021-05-11
Published:2021-05-11
Updated:2022-07-12
Summary:Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/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): Low
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:4.0 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
8.5 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-706
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-31920

Source: XF
Type: UNKNOWN
istio-cve202131920-sec-bypass(202710)

Source: CCN
Type: ISTIO-SECURITY-2021-005
Istio

Source: CONFIRM
Type: Exploit, Vendor Advisory
https://istio.io/latest/news/security/istio-security-2021-005/

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-31920

Vulnerable Configuration:Configuration 1:
  • cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version >= 1.9.0 and < 1.9.5)
  • OR cpe:/a:istio:istio:*:*:*:*:*:*:*:* (Version < 1.8.6)

    • Configuration CCN 1:
  • cpe:/a:istio:istio:1.8.0:-:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.9.0:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    istio istio *
    istio istio *
    istio istio 1.8.0 -
    istio istio 1.9.0 -