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CVE-2023-50714— The Oauth2 PKCE implementation is vulnerable

Quick assessment

Affected
yiisoft yii2-authclient
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

yii2是一个快速、安全和专业的PHP框架。 yii2-authclient 2.2.15之前版本存在安全漏洞，该漏洞源于容易受到跨站请求伪造(CSRF)攻击。

CVSS 6.8 · Medium EPSS 0.49% · P41
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I. Basic Information for CVE-2023-50714

Vulnerability Information
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Vulnerability Title
The Oauth2 PKCE implementation is vulnerable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
yii2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
yii2是一个快速、安全和专业的PHP框架。 yii2-authclient 2.2.15之前版本存在安全漏洞，该漏洞源于容易受到跨站请求伪造(CSRF)攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
yiisoft yii2-authclient < 2.2.15 -

II. Public POCs for CVE-2023-50714

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III. Intelligence Information for CVE-2023-50714

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Patches & Fixes for CVE-2023-50714 (1)

Vendor Advisories for CVE-2023-50714 (1)

Other References for CVE-2023-50714 (3)

IV. Related Vulnerabilities

Same product: yii2-authclient
Same vendor: yiisoft
Same weakness: CWE-918

V. Comments for CVE-2023-50714

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