GNOME Structured File Library ole_init_info() Heap Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID: 1017320|
SecurityTracker URL: http://securitytracker.com/id/1017320
(Links to External Site)
Date: Nov 30 2006
Execution of arbitrary code via network, User access via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): prior to 1.14.2|
A vulnerability was reported in GNOME Structured File Library (libgsf). A remote user can cause arbitrary code to be executed on the target user's system.|
A remote user can create a specially crafted OLE file that, when loaded by the target user, will trigger a heap overflow and execute arbitrary code on the target system. The code will run with the privileges of the target user.
The ole_init_info() function is affected.
The vendor was notified on August 17, 2006.
infamous41md discovered this vulnerability.
A remote user can create an OLE file that, when loaded by the target user, will execute arbitrary code on the target user's system.|
The vendor has issued a fixed version (1.14.2), available at:|
Vendor URL: gnome.org/ (Links to External Site)
|Underlying OS: Linux (Any), UNIX (Any)|
This archive entry has one or more follow-up message(s) listed below.|
Source Message Contents
Subject: [Full-disclosure] iDefense Security Advisory 11.30.06: Multiple|
Multiple Vendor libgsf Heap Overflow Vulnerability
iDefense Security Advisory 11.30.06
Nov 30, 2006
The GNOME Structured File Library is a utility library for reading and
writing structured file formats. This library replaces libole2 and is used
in projects such as gnumeric, mrproject, abiword, libwv2 and koffice. It is
generally used to access MS OLE2 streams. For more information, see:
Remote exploitation of a heap overflow vulnerability in libgsf, as included
in various vendors' operating system distributions, could allow an attacker
to execute arbitrary code.
The problem specifically exists in the 'ole_init_info' function; the
function only obtains enough for the number specified in 'num_bat' when
allocating memory. Later, when reading the file contents, the number
specified in 'num_metabat' is used as the bounds for a loop. Due to
insufficient validation of the aforementioned variables, an attacker could
cause a heap overflow.
Successful exploitation of this vulnerability requires an attacker to
persuade a user into opening a specially crafted OLE document. If
successful, the attacker could execute arbitrary code with the permissions
of the victim.
Inside of the 'ole_info_read_metabat' function, values read from the file
are validated to be within a range which depends on the size of the file.
Successful exploitation may be somewhat mitigated by this validation.
However, as file size increases, the number of allowed values increases.
iDefense has confirmed the existence of this vulnerability in version
1.14.0 of the Gnome Structured File library. Any applications or libraries
that utilize this library for OLE should be considered vulnerable.
iDefense is unaware of any effective workarounds at this time.
VI. VENDOR RESPONSE
The libgsf maintainers have addressed this problem with version 1.14.2.
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4514 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
VIII. DISCLOSURE TIMELINE
08/17/2006 Initial vendor notification
08/17/2006 Initial vendor response
11/30/2006 Coordinated public disclosure
This vulnerability was reported to iDefense by infamous41md.
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