CVE-2023-33962
JStachio XSS vulnerability: Unescaped single quotes
描述
### Impact #### Description: JStachio fails to escape single quotes `'` in HTML, allowing an attacker to inject malicious code. #### Reproduction Steps: Use the following template code: ```html <div attr='{{value}}'></div> ``` Set the value variable to `' onblur='alert(1)`. ```java public class Escaping { public static void main(String[] args) { Model model = new Model("' onblur='alert(1)"); String result = AttributeTemplate.of().execute(model); System.out.println(result); } @JStache(template = "<div attr='{{value}}'></div>", name="AttributeTemplate") @JStacheConfig(contentType= Html.class) public static class Model { public final String value; public Model(String value) { this.value = value; } public String getValue() { return value; } } } ``` Expected Result: The resulting output should have properly escaped the single quotes and not execute the injected JavaScript code. Actual Result: The resulting output is vulnerable and renders as follows: ```html <div attr='' onblur='alert(1)'></div> ``` #### Impact and Risk: This vulnerability can be exploited by an attacker to execute arbitrary JavaScript code in the context of other users visiting pages that use this template engine. This can lead to various consequences, including session hijacking, defacement of web pages, theft of sensitive information, or even the propagation of malware. #### Proposed Solution: To mitigate this vulnerability, the template engine should properly escape special characters, including single quotes. Common practice is to escape `'` as `'`. ### Patches - ### Workarounds As long as users stick with double quotes `"` for HTML attributes, they should not be affected. ### References For instance, [Rocker's general purpose HTML escaping](https://github.com/fizzed/rocker/blob/d749fbf68179b31a64d541f5e18e0e25bc5c2d1b/rocker-runtime/src/main/java/com/fizzed/rocker/runtime/DefaultHtmlStringify.java#L64)
如何修補 CVE-2023-33962
要修補 CVE-2023-33962,請將受影響套件升級到下列已修補版本。
- —升級至 1.0.1 或更新版本
CVE-2023-33962 正在被利用嗎?
低 — EPSS 為 0.6%,目前沒有觀察到大規模利用活動。