[UNIX] VMPS Syslog Format String Vulnerability

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VMPS Syslog Format String Vulnerability
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SUMMARY

<http://sourceforge.net/projects/vmps> VMPS (VLAN Management Policy
Server) is "a way of assigning switch ports to specific VLANs based on MAC
address of connecting device. OpenVMPS is a GPL implementation of VMPS".

A format string vulnerability in VMPS allows remote attackers to cause the
program to execute arbitrary.

DETAILS

Vulnerable Systems:
* VMPS version 1.3

The format string vulnerability can be found in /vmpsd-1.3/log.c file:

void vmps_log(const int level, const char *fmt, ...)
{

char str[256];
va_list ap;

if ( ((log_level & 0xFF00) >= (level & 0xFF00)) &&
((level & log_level & 0x00FF) > 0) ) {

va_start(ap, fmt);

if ( !log_opened ) {
openlog("vmpsd", LOG_CONS, LOG_LOCAL6);
log_opened = 1;
}
vsnprintf(str, 256, fmt, ap);
syslog(LOG_INFO, str); // here is the bug

ADDITIONAL INFORMATION

The information has been provided by <mailto:mazahaquer@ok.kz>
mazahaquer.

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