AnalogX Proxy Server Vulnerable to DoS Attack

Reported November 15, 2000 by Network Security Solutions Inc.

VERSIONS AFFECTED

Analog X Proxy Server 4.10

DESCRIPTION

By sending multiple abnormal strings to either the FTP, SMTP, POP, or Proxy Logger services a malicious user could cause the Proxy server to stop functioning and the system to require a reboot.

The following is sample logfile output from an attacked Analog X Proxy Server;

FTP Service error msg.:
ABORT: Last String too large for Buffer (1509 > 1024)

                                (log.c/114)

   POP3 Service error msg.:
                           ABORT: Last String too large for Buffer (1509 > 1024)

(log.c/114)

SMTP Service error msg.:
                   ABORT: Last String too large for Buffer (10301 > 1024)
                        (log.c/114)

Services such as HTTP, SOCKS, and NNTP are not effected.

VENDOR RESPONSE

The vendor has been notified but no patch has be released.

CREDIT
Discovered by NSS Inc.

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