Reflected Cross-site Scripting in yiisoft/yii2 Debug mode

Yii 2 is a PHP application framework. During internal penetration testing of a product based on Yii2, users discovered a Cross-site Scripting (XSS) vulnerability within the framework itself. This issue is relevant for the latest version of Yii2 (2.0.49.3). This issue lies in the mechanism for displaying function argument values in the stack trace. The vulnerability manifests when an argument's value exceeds 32 characters. For convenience, argument values exceeding this limit are truncated and displayed with an added "...". The full argument value becomes visible when hovering over it with the mouse, as it is displayed in the title attribute of a span tag. However, the use of a double quote (") allows an attacker to break out of the title attribute's value context and inject their own attributes into the span tag, including malicious JavaScript code through event handlers such as onmousemove. This vulnerability allows an attacker to execute arbitrary JavaScript code in the security context of the victim's site via a specially crafted link. This could lead to the theft of cookies (including httpOnly cookies, which are accessible on the page), content substitution, or complete takeover of user accounts. This issue has been addressed in version 2.0.50. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Yii 安全漏洞

Yii是YII团队的开发的一套基于组件、用于开发大型Web应用的高性能PHP框架。 Yii 2 2.0.49.3版本存在安全漏洞，该漏洞源于允许攻击者通过特制链接在受害者网站的安全上下文中执行任意 JavaScript 代码，导致 cookie被盗、内容替换或完全接管用户帐户。

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