CVE-2021-31920

CVSS V2 Medium 4 CVSS V3 Medium 6.5

Description

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.

Overview

CVE ID
CVE-2021-31920

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2021-05-27T05:15:06

Last Modified Date
2022-07-12T17:42:04

Weakness Enumerations

CWE	URL
CWE-706	http://cwe.mitre.org/data/definitions/706.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:a:istio:istio::::::::	1	OR		1.8.6
cpe:2.3:a:istio:istio::::::::	1	OR	1.9.0	1.9.5

CVSS Version 2

Version
2.0

Vector String
AV:N/AC:L/Au:S/C:P/I:N/A:N

Access Vector
NETWORK

Access Compatibility
LOW

Authentication
SINGLE

Confidentiality Impact
PARTIAL

Integrity Impact
NONE

Availability Impact
NONE

Base Score
4

Severity
MEDIUM

Exploitability Score
8

Impact Score
2.9

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
NONE

Base Score
6.5

Base Severity
MEDIUM

Exploitability Score
2.8

Impact Score
3.6

References

Reference URL	Reference Tags
https://istio.io/latest/news/security/istio-security-2021-005/	Exploit Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-31920
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31920

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 07:12:25				Added to TrackCVE
2022-12-05 03:06:38	2021-05-27T05:15Z	2021-05-27T05:15:06	CVE Published Date	updated
2022-12-05 03:06:38		2022-07-12T17:42:04	CVE Modified Date	updated
2022-12-05 03:06:38		Analyzed	Vulnerability Status	updated