[UNIX] ktools Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 11/27/05

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Date: 27 Nov 2005 12:58:17 +0200

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      ktools Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    " <http://konst.org.ua/ktools> ktools main purpose is to provide various
    text-mode user interface controls without a need to write too much code."

    Lack of proper length validation by the ktools product, allows attackers
    to cause the program to execute arbitrary code by overflowing an internal
    buffer.

    DETAILS

    Vulnerable Systems:
     * ktools version 0.3 and prior

    The macro VGETSTRING in the header file of kkstrtext.h contain a buffer
    overflow for any string that is bigger then 1024 chars. The programs
    centericq, Orpheus, Motor and Groan use ktools and are therefore
    vulnerable to attack.

    Vulnerable Code:
    kkstrtext.h:
    #define VGETSTRING(c, fmt) \
      { \
          va_list vgs__ap; char vgs__buf[1024]; \
          va_start(vgs__ap, fmt); \
          vsprintf(vgs__buf, fmt, vgs__ap); c = vgs__buf; \
          va_end(vgs__ap); \
      }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:siegfri3d@gmail.com>
    Siegfried.
    The original article can be found at:
    <http://www.zone-h.org/en/advisories/read/id=8480/>
    http://www.zone-h.org/en/advisories/read/id=8480/

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