Publish-It 3.6d - Buffer Overflow







Core Security - Corelabs Advisory

Publish-It Buffer Overflow Vulnerability

1. *Advisory Information*

Title: Publish-It Buffer Overflow Vulnerability
Advisory ID: CORE-2014-0001
Advisory URL:
Date published: 2014-02-05
Date of last update: 2014-02-05
Vendors contacted: Poster Software
Release mode: User release

2. *Vulnerability Information*

Class: Buffer overflow [CWE-119]
Impact: Code execution
Remotely Exploitable: No
Locally Exploitable: Yes
CVE Name: CVE-2014-0980

3. *Vulnerability Description*

Publish-It [1] is prone to a (client side) security vulnerability when
processing .PUI files. This vulnerability could be exploited by a remote
attacker to execute arbitrary code on the target machine, by enticing
the user of Publish-It to open a specially crafted .PUI file.

4. *Vulnerable Packages*

 . Publish-It v3.6d for Win XP.
 . Publish-It v3.6d for Win 7.
 . Other versions are probably affected too, but they were not checked.

5. *Vendor Information, Solutions and Workarounds*

There was no official answer from vendor after several attempts to
report this vulnerability (see [Sec. 8]). As mitigation action, given
that this is a client-side vulnerability, avoid to open untrusted .PUI
files. Contact vendor for further information.
6. *Credits*

This vulnerability was discovered and researched by Daniel Kazimirow
from Core Exploit Writers Team.

7. *Technical Description / Proof of Concept Code*

Below is shown the result of opening the Proof of concept file [2] on
Windows XP SP3 (EN).
EAX 04040404
ECX 00000325
EBX 77F15B70 GDI32.SelectObject
ESP 0012F5D4
EBP 77F161C1 GDI32.GetStockObject
ESI 0103A1E8
EDI A50107D3
EIP 04040404
C 0  ES 0023 32bit 0(FFFFFFFF)
P 0  CS 001B 32bit 0(FFFFFFFF)
A 1  SS 0023 32bit 0(FFFFFFFF)
Z 0  DS 0023 32bit 0(FFFFFFFF)
S 0  FS 003B 32bit 7FFDF000(FFF)
T 0  GS 0000 NULL
D 0
O 0  LastErr ERROR_SUCCESS (00000000)
EFL 00000212 (NO,NB,NE,A,NS,PO,GE,G)
ST0 empty -??? FFFF 00000001 00010002
ST1 empty -??? FFFF 00000043 004F007A
ST2 empty -??? FFFF 7590A3E7 FDBDC8F2
ST3 empty -??? FFFF 00000043 0050007B
ST4 empty 1.0000000000000000000
ST5 empty -9.2233720368547758080e+18

The arbitrary value 0x04040404 is stored in the EIP register where our
shellcode starts (just a software breakpoint 0xCC):
04040404    CC              INT3
04040405    CC              INT3
04040406    CC              INT3
04040407    CC              INT3
04040408    CC              INT3
04040409    CC              INT3
0404040A    CC              INT3
0404040B    CC              INT3

As a result, the normal execution flow can be altered in order to
execute arbitrary code.

8. *Report Timeline*

. 2013-12-20:
Core Security Technologies attempts to contact vendor. Publication date
is set for Jan 21st, 2014.
. 2014-01-06:
Core attempts to contact vendor.
. 2014-01-15:
Core asks for confirmation of the initial contact e-mail.
. 2014-01-15:
Vendor sends an e-mail with a single word: "Confirmed".
. 2014-01-16:
Core sends a technical description and asks for an estimated release
date. No reply received.
. 2014-01-21:
First release date missed.
. 2014-01-27:
Core attempts to contact vendor. No reply received.
. 2014-02-05:
After one month and a half trying to contact vendor the only reply from
them was the word "Confirmed" and the advisory CORE-2014-0001 is
published as 'User release'.

9. *References*


10. *About CoreLabs*

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with anticipating the future needs and requirements for information
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11. *About Core Security Technologies*

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12. *Disclaimer*

The contents of this advisory are copyright (c) 2014 Core Security
Technologies and (c) 2014 CoreLabs, and are licensed under a Creative
Commons Attribution Non-Commercial Share-Alike 3.0 (United States)

13. *PGP/GPG Keys*

This advisory has been signed with the GPG key of Core Security
Technologies advisories team, which is available for download at