Handlebars.js has JavaScript Injection via AST Type Confusion by tampering @partial-block

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the `@partial-block` special variable is stored in the template data context and is reachable and mutable from within a template via helpers that accept arbitrary objects. When a helper overwrites `@partial-block` with a crafted Handlebars AST, a subsequent invocation of `{{> @partial-block}}` compiles and executes that AST, enabling arbitrary JavaScript execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. First, use the runtime-only build (`require('handlebars/runtime')`). The `compile()` method is absent, eliminating the vulnerable fallback path. Second, audit registered helpers for any that write arbitrary values to context objects. Helpers should treat context data as read-only. Third, avoid registering helpers from third-party packages (such as `handlebars-helpers`) in contexts where templates or context data can be influenced by untrusted input.

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

对生成代码的控制不恰当(代码注入)

Handlebars.js 安全漏洞

Handlebars.js是The Handlebars Templating Language开源的一个JavaScript语义模板引擎。 Handlebars.js 4.7.8及之前版本存在安全漏洞，该漏洞源于@partial-block特殊变量可通过助手函数被覆盖，可能导致攻击者执行任意JavaScript代码，引发服务器端远程代码执行。

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