[UNIX] VMPS Syslog Format String Vulnerability
From: SecuriTeam (support_at_securiteam.com)
Date: 10/10/05
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To: list@securiteam.com Date: 10 Oct 2005 14:07:30 +0200
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VMPS Syslog Format String Vulnerability
------------------------------------------------------------------------
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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