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Sicherheit: Pufferüberläufe in bind
Aktuelle Meldungen Distributionen
Name: Pufferüberläufe in bind
ID: TLSA2001004-1
Distribution: TurboLinux
Plattformen: TurboLinux 6.0, TurboLinux 6.1 WorkStation
Datum: Fr, 23. Februar 2001, 12:00
Referenzen: Keine Angabe
Applikationen: BIND

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___________________________________________________________________________

TurboLinux Security Announcement

Package: Bind
Vulnerable Packages: All versions previous to 8.2.3
Date: 02/21/2001 5:00 PDT

Affected TurboLinux versions:TL 6.1 WorkStation,
All TurboLinux versions
6.0.5 and earlier

TurboLinux Advisory ID#: TLSA2001004-1

Credits: Vulnerabilities discovered by the COVERT Labs at PGP Security
and Claudio Musmarra. Also, special thanks to Andrew
Cameron<apcameron@hotmail.com> for sending an email notifying
us of this issue.
___________________________________________________________________________

Two vulnerabilities have been discovered in ISC BIND 8. Please update
the packages in your installation as soon as possible.
___________________________________________________________________________

1. Problem Summary(From the CERT/CC, CERT Advisory CA-2001-02)

A. ISC BIND 8 contains a buffer overflow in transaction signature (TSIG)
handling code.

During the processing of a transaction signature (TSIG), BIND 8 checks
for the presence of TSIGs that fail to include a valid key. If such a
TSIG is found, BIND skips normal processing of the request and jumps
directly to code designed to send an error response. Because the error-
handling code initializes variables differently than in normal processing
it invalidates the assumptions that later function calls make about the
size of the request buffer.

Once these assumptions are invalidated, the code that adds a new (valid)
signature to the responses may overflow the request buffer and overwrite
adjacent memory on the stack or the heap. When combined with other buffer
overflow exploitation techniques, an attacker can gain unauthorized
privileged access to the system, allowing the execution of arbitrary code.

B. Queries to ISC BIND servers may disclose environment variables

This vulnerability is an information leak in the query processing
code of BIND 8 that allows a remote attacker to access the program
stack, possibly exposing program and/or environment variables. This
vulnerability is triggered by sending a specially formatted query to
vulnerable BIND servers.

2. Impact(From CERT/CC, CERT Advisory CA-2001-02)

A. ISC BIND 8 contains buffer overflow in transaction signature
(TSIG) handling code

This vulnerability may allow an attacker to execute code with the same
privileges as the BIND server. Because BIND is typically run by a
superuser account, the execution would occur with superuser privileges.


B. Queries to ISC BIND servers may disclose environment variables

This vulnerability may allow attackers to read information from the
program stack, possibly exposing environment variables.

3. Solution

Update each package from our ftp server by running the following command:

rpm -Uvh ftp_path_to_filename

Where ftp_path_to_filename is the following:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/bind-8.2.3-2.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/bind-contrib-8.2.3-2.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/bind-devel-8.2.3-2.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/bind-utils-8.2.3-2.i386.rpm

The source RPM can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/bind-8.2.3-2.src.rpm

**Note: You must rebuild and install the RPM if you choose to download
and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE
THE SECURITY HOLE.

Please verify the MD5 checksums of the updates before you install:

MD5 sum Package Name
---------------------------------------------------------------------------
dec967e3a1dd16bdcca0c6fe6e9114d6 bind-8.2.3-2.i386.rpm
2e84bbbcd6a09d7c5060dd01480ff3de bind-contrib-8.2.3-2.i386.rpm
06612093126372f8d618ea842fd402ec bind-devel-8.2.3-2.i386.rpm
3f390ce4d1b7ceaa477df62cc3fe3174 bind-utils-8.2.3-2.i386.rpm
25c701c7158af3f773d1a478c8872d05 bind-8.2.3-2.src.rpm
___________________________________________________________________________

These packages are GPG signed by TurboLinux for security. Our key
is available here:

http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

rpm --checksig --nogpg name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.

___________________________________________________________________________
You can find more updates on our ftp server:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation
and Server security updates
ftp://ftp.turbolinux.com/pub/updates/4.0/security/ for TL4.0 Workstation
and Server security updates

Our webpage for security announcements:

http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

security@turbolinux.com
___________________________________________________________________________

Subscribe to the TurboLinux Security Mailing lists:

TL-security - A moderated list for discussing security issues
TurboLinux products.
Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

TL-security-announce - An announce-only mailing list for security updates
and alerts.

Subscribe at:

http://www.turbolinux.com/mailman/listinfo/tl-security-announce

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