The Oauth2 PKCE implementation is vulnerable
CVE-2023-50714

6.8MEDIUM

Key Information:

Vendor

Yiisoft

Status
Yii2-authclient
Vendor
CVE Published:
22 December 2023

What is CVE-2023-50714?

yii2-authclient is an extension that adds OpenID, OAuth, OAuth2 and OpenId Connect consumers for the Yii framework 2.0. In yii2-authclient prior to version 2.2.15, the Oauth2 PKCE implementation is vulnerable in 2 ways. First, the authCodeVerifier should be removed after usage (similar to authState). Second, there is a risk for a downgrade attack if PKCE is being relied on for CSRF protection. Version 2.2.15 contains a patch for the issue. No known workarounds are available.

Affected Version(s)

yii2-authclient < 2.2.15

References

https://github.com/yiisoft/yii2-authclient/security/advis...
x_refsource_CONFIRM
https://github.com/yiisoft/yii2-authclient/commit/721ed97...
x_refsource_MISC
https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f...
x_refsource_MISC

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.