Fetchmail Can Be Crashed By Remote Users Sending E-Mail With Certain Header Contents
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SecurityTracker Alert ID: 1001757 |
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SecurityTracker URL: http://securitytracker.com/id/1001757
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jun 15 2001
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 5.6.8-2 for Null crash; 5.7.1-2 for SPAM crash; possibly others
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Description:
A vulnerability has been reported in the Fetchmail remote mail retrieval software. A remote user can send an e-mail with a long "To:" header that will cause Fetchmail to crash.
Fetchmail reportedly contains a buffer overflow in the handling of headers. It may be possible to exploit this overflow to execute arbitrary code with the privileges of the fetchmail daemon, but this was not confirmed.
If a remote user sends e-mail with a large "To:" line (greater than 25000 characters), Fetchmail will crash with a segmentation fault.
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Impact:
A remote user can cause the Fetchmail daemon to crash.
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Solution:
The vendor has fixed the problem in versions 5.8.5-2 and 5.8.6-1.
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Vendor URL: www.tuxedo.org/~esr/fetchmail/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Thu, 14 Jun 2001 16:54:35 -0700
Subject: fetchmail update -- Immunix OS 6.2, 7.0-beta, 7.0
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--LYw3s/afESlflPpp
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-----------------------------------------------------------------------
Immunix OS Security Advisory
Packages updated: fetchmail
Affected products: Immunix OS 6.2, 7.0-beta, and 7.0
Bugs fixed: immunix/1618
Date: Wed Jun 13 2001
Advisory ID: IMNX-2001-70-025-01
Author: Seth Arnold <sarnold@wirex.com>
-----------------------------------------------------------------------
Description:
Fetchmail, as shipped with Immunix OS 6.2 and 7.0, contains a buffer
overflow in the handling of headers. StackGuard will prevent exploits
from granting privileges; however, denial of service attacks are
possible.
References:
http://bugs.debian.org/cgi-bin/bugreport.cgi?archive=no&bug=100394
Thanks go to Wolfram Kleff for finding this problem and Henrique de
Moraes Holschuh for supplying a fix.
Package names and locations:
Precompiled binary packages for Immunix 6.2 are available at:
http://download.immunix.org/ImmunixOS/6.2/updates/RPMS/fetchmail-5.3.1-2_StackGuard.i386.rpm
http://download.immunix.org/ImmunixOS/6.2/updates/RPMS/fetchmailconf-5.3.1-2_StackGuard.i386.rpm
Source packages for Immunix 6.2 are available at:
http://download.immunix.org/ImmunixOS/6.2/updates/SRPMS/fetchmail-5.3.1-2_StackGuard.src.rpm
Precompiled binary packages for Immunix 7.0-beta and 7.0 are available at:
http://download.immunix.org/ImmunixOS/7.0/updates/RPMS/fetchmail-5.5.0-4_imnx.i386.rpm
http://download.immunix.org/ImmunixOS/7.0/updates/RPMS/fetchmailconf-5.5.0-4_imnx.i386.rpm
Source package for Immunix 7.0-beta and 7.0 is available at:
http://download.immunix.org/ImmunixOS/7.0/updates/SRPMS/fetchmail-5.5.0-4_imnx.src.rpm
md5sums of the packages:
6.2:
ea10b64694935dd20be38df09924736a RPMS/fetchmail-5.3.1-2_StackGuard.i386.rpm
fdebb78fcabdc43a811f9ed546252850 RPMS/fetchmailconf-5.3.1-2_StackGuard.i386.rpm
eb7af556575d1d0e6e59976aa5b09730 SRPMS/fetchmail-5.3.1-2_StackGuard.src.rpm
7.0:
e8169308534f68bc978ed2c1bc0aeeca RPMS/fetchmail-5.5.0-4_imnx.i386.rpm
242f4aa0fe21c71f1ddce4cf5c6cb0a0 RPMS/fetchmailconf-5.5.0-4_imnx.i386.rpm
c8c4069439fe66caf013fea502947ada SRPMS/fetchmail-5.5.0-4_imnx.src.rpm
GPG verification:
Our public key is available at <http://wirex.com/security/GPG_KEY>.
*** NOTE *** This key is different from the one used in advisories
IMNX-2001-70-020-01 and earlier.
Online version of all Immunix 6.2 updates and advisories:
http://immunix.org/ImmunixOS/6.2/updates/
Online version of all Immunix 7.0-beta updates and advisories:
http://immunix.org/ImmunixOS/7.0-beta/updates/
Online version of all Immunix 7.0 updates and advisories:
http://immunix.org/ImmunixOS/7.0/updates/
NOTE:
Ibiblio is graciously mirroring our updates, so if the links above are
slow, please try:
ftp://ftp.ibiblio.org/pub/Linux/distributions/immunix/
or one of the many mirrors available at:
http://www.ibiblio.org/pub/Linux/MIRRORS.html
Contact information:
To report vulnerabilities, please contact security@wirex.com. WireX
attempts to conform to the RFP vulnerability disclosure protocol
<http://www.wiretrip.net/rfp/policy.html>.
--LYw3s/afESlflPpp
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