(OpenBSD Issues Fix) Zlib Buffer Overflow in inflate_table() May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1014425 |
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SecurityTracker URL: http://securitytracker.com/id/1014425
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CVE Reference:
CVE-2005-2096
(Links to External Site)
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Date: Jul 8 2005
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Impact:
Denial of service via network, Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 1.2.2
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Description:
A buffer overflow was reported in zlib in the processing of compressed data streams. A remote user may be able to cause denial of service conditions or execute arbitrary code on the target system.
A user can create a specially crafted compressed data stream that, when processed by an application using zlib, will trigger an overflow in the inflate_table() function and cause the application to crash or execute arbitrary code.
The vulnerability resides in 'inftrees.c'.
Tavis Ormandy of the Gentoo Linux Security Audit Team discovered this vulnerability.
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Impact:
A user can cause an application using zlib to crash or execute arbitrary code. The specific impact depends on the application.
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Solution:
OpenBSD has released a fix.
For 3.6:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.6/common/019_libz.patch
For 3.7:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.7/common/004_libz.patch
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Vendor URL: www.zlib.org/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
UNIX (OpenBSD)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 07 Jul 2005 21:18:34 -0600
Subject: Buffer overflow in zlib
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Insufficient checking in the zlib compression library (installed
as libz on OpenBSD) can result in a buffer overflow and a program
crash. It is not known at this time whether maliciously-crafted
compressed files can be used to execute arbitrary code.
Since zlib is in wide use throughout the base OS, as well as in
ports, users are advised to patch their systems as soon as possible.
A fix has been committed to OpenBSD-current as well as the 3.6 and
3.7 -stable branches. Patches are also available for OpenBSD 3.6
and 3.7. OpenBSD versions 3.4 and lower are not affected as they
use an older version of zlib that does not contain the vulnerable
code.
3.6 patch:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.6/common/019_libz.patch
3.7 patch:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.7/common/004_libz.patch
The 3.6 patch also applies to OpenBSD 3.5.
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