what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

o3read.txt

o3read.txt
Posted Dec 30, 2004
Authored by Wiktor Kopec

o3read version 0.0.3 suffers from a buffer overflow condition in the parse_html() function used when parsing HTML content.

tags | advisory, overflow
SHA-256 | db690ba8a5fb9f6261dc6bc447acbbda88abdeeb6d4898680a7bcd3cc9f2c0e1

o3read.txt

Change Mirror Download
From djb@cr.yp.to Wed Dec 15 14:22:56 2004
Date: 15 Dec 2004 08:29:07 -0000
From: D. J. Bernstein <djb@cr.yp.to>
To: securesoftware@list.cr.yp.to, o3read@siag.nu
Subject: [remote] [control] o3read 0.0.3 parse_html overflows t buffer

Wiktor Kopec, a student in my Fall 2004 UNIX Security Holes course, has
discovered a remotely exploitable security hole in o3read, a converter
for SXW files. I'm publishing this notice, but all the discovery credits
should be assigned to Kopec.

You are at risk if you take an SXW document from an email message (or a
web page or any other source that could be controlled by an attacker)
and feed it through o3read. (The o3read documentation does not tell
users to avoid taking input from the network.) Whoever provides that
document then has complete control over your account: he can read and
modify your files, watch the programs you're running, etc.

Proof of concept: On an x86 computer running FreeBSD 4.10, type

wget ftp://siag.nu/pub/o3read/o3read-0.0.3.tar.gz
gunzip < o3read-0.0.3.tar.gz | tar -xf -
cd o3read-0.0.3
make

to download and compile the o3read program, version 0.0.3 (current).
Then save the file 58.xml attached to this message, and type

./o3read < 58.xml

with the unauthorized result that a file named x is removed from the
current directory. (I tested this with a 535-byte environment, as
reported by printenv | wc -c.)

Here's the bug: In o3read.c, parse_html copies any number of bytes into
a 1024-byte t[] array.

---D. J. Bernstein, Associate Professor, Department of Mathematics,
Statistics, and Computer Science, University of Illinois at Chicago

[ Part 2, Text/PLAIN (charset: unknown-8bit) 39 lines. ]
[ Unable to print this part. ]

Login or Register to add favorites

File Archive:

August 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Aug 1st
    20 Files
  • 2
    Aug 2nd
    4 Files
  • 3
    Aug 3rd
    6 Files
  • 4
    Aug 4th
    55 Files
  • 5
    Aug 5th
    16 Files
  • 6
    Aug 6th
    0 Files
  • 7
    Aug 7th
    0 Files
  • 8
    Aug 8th
    13 Files
  • 9
    Aug 9th
    13 Files
  • 10
    Aug 10th
    34 Files
  • 11
    Aug 11th
    16 Files
  • 12
    Aug 12th
    5 Files
  • 13
    Aug 13th
    0 Files
  • 14
    Aug 14th
    0 Files
  • 15
    Aug 15th
    25 Files
  • 16
    Aug 16th
    3 Files
  • 17
    Aug 17th
    0 Files
  • 18
    Aug 18th
    0 Files
  • 19
    Aug 19th
    0 Files
  • 20
    Aug 20th
    0 Files
  • 21
    Aug 21st
    0 Files
  • 22
    Aug 22nd
    0 Files
  • 23
    Aug 23rd
    0 Files
  • 24
    Aug 24th
    0 Files
  • 25
    Aug 25th
    0 Files
  • 26
    Aug 26th
    0 Files
  • 27
    Aug 27th
    0 Files
  • 28
    Aug 28th
    0 Files
  • 29
    Aug 29th
    0 Files
  • 30
    Aug 30th
    0 Files
  • 31
    Aug 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Hosting By
Rokasec
close