CVE-2023-50714

Public Exploit
The Oauth2 PKCE implementation is vulnerable

Description

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.

Categories

6.8
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.11%
Third-Party Advisory github.com
Affected: yiisoft yii2-authclient
Published at:
Updated at:

References

Link Tags
https://github.com/yiisoft/yii2-authclient/security/advisories/GHSA-rw54-6826-c8j5 third party advisory exploit
https://github.com/yiisoft/yii2-authclient/commit/721ed974bc44137437b0cdc8454e137fff8db213 patch
https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth1.php#L158 product
https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth2.php#L121 product
https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OpenIdConnect.php#L420 product

Frequently Asked Questions

What is the severity of CVE-2023-50714?
CVE-2023-50714 has been scored as a medium severity vulnerability.
How to fix CVE-2023-50714?
To fix CVE-2023-50714, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-50714 being actively exploited in the wild?
It is possible that CVE-2023-50714 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-50714?
CVE-2023-50714 affects yiisoft yii2-authclient.
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