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TITLE:
Zaptel "ZT_SPANCONFIG" IOCTL Privilege Escalation Vulnerabilities

SECUNIA ADVISORY ID:
SA32947

VERIFY ADVISORY:
http://secunia.com/advisories/32947/

CRITICAL:
Not critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
Zaptel 1.x
http://secunia.com/advisories/product/20644/

DESCRIPTION:
Some vulnerabilities have been reported in Zaptel, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service) and potentially gain escalated privileges.

The vulnerabilities are caused due to the "tor2_spanconfig()"
function in kernel/tor2.c and the "torisa_spanconfig()" function in
kernel/torisa.c not properly sanitising the "sync" field of the
"ZT_SPANCONFIG" IOCTL. This can potentially be exploited to gain
escalated privileges by sending a specially crafted "ZT_SPANCONFIG"
IOCTL to a vulnerable driver.

Successful exploitation requires that the driver for the "Tormenta 2
Quad-T1 PCI" or "Tormenta ISA" card is used.

SOLUTION:
Fixed in the SVN repository.

Zaptel 1.2.x:
http://svn.digium.com/view/zaptel?view=rev&revision=4587

Zaptel 1.4.x:
http://svn.digium.com/view/zaptel?view=rev&revision=4588

PROVIDED AND/OR DISCOVERED BY:
Tzafrir Cohen

ORIGINAL ADVISORY:
Digium Bug #13954:
http://bugs.digium.com/view.php?id=13954

Debian Bug #507459:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=507459

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