(Caldera Issues Fix for OpenServer) Sendmail Buffer Overflow in Parsing Certain Header Comments May Let Remote Users Execute Arbitrary Code with Root Privileges
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SecurityTracker Alert ID: 1006282 |
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SecurityTracker URL: http://securitytracker.com/id/1006282
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CVE Reference:
CAN-2002-1337
(Links to External Site)
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Date: Mar 13 2003
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Impact:
Execution of arbitrary code via local system, Execution of arbitrary code via network, Root access via local system, Root access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 5.79 - 8.12.7
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Description:
A buffer overflow vulnerability was reported in the Sendmail mail transfer agent (MTA). A remote user could execute arbitrary code with the privileges of the mail server (typically root privileges)
It is reported that the software contains an exploitable buffer overflow in the parsing of certain SMTP header elements. The report indicates that long sender or recipient header comments may trigger the flaw. A remote user could create a specially crafted message to cause arbitrary code to be executed on the target server. The target server could be the sending MTA, an intermediate MTA, or the destination MTA.
The vendor has labeled this bug as a "critical security problem."
The vendor credits Mark Dowd of ISS X-Force with reporting the flaw.
Another buffer overflow was reported in the processing of RFC 1413 ident protocol messages (this was discovered by a different user). According to the vendor, this is "non-exploitable."
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Impact:
A remote user could execute arbitrary code with the privileges of the target server, which is typically root privileges. Any MTA processing the message may be affected.
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Solution:
Caldera has released a fix for OpenServer.
OpenServer 5.0.5:
Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.6
Verification
MD5 (sendmail.506.tar) = da105d0a82313ed19bc10b515467e93f
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download the sendmail.506.tar file to the /tmp directory (OpenServer 5.0.5 uses the 5.0.6 tar image)
2) Extract the files from the tar archive:
cd /tmp; tar xvf sendmail.506.tar
3) Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.
OpenServer 5.0.6:
Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.6
Verification
MD5 (sendmail.506.tar) = da105d0a82313ed19bc10b515467e93f
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download the sendmail.506.tar file to the /tmp directory
2) Extract the files from the tar archive:
cd /tmp; tar xvf sendmail.506.tar
3) Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.
OpenServer 5.0.7:
Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.6
Verification
MD5 (sendmail.507.tar) = 807f1fa8d15a3361a589119bfca18533
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download the sendmail.507.tar file to the /tmp directory
2) Extract the files from the tar archive:
cd /tmp; tar xvf sendmail.507.tar
3) Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.
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Vendor URL: www.sendmail.org/8.12.8.html (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
UNIX (Open UNIX-SCO)
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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, 13 Mar 2003 09:57:17 -0800
Subject: Security Update: [CSSA-2003-SCO.6] OpenServer 5.0.5 OpenServer 5.0.6 OpenServer 5.0.7 : remote buffer overflow in sendmail
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To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca
______________________________________________________________________________
SCO Security Advisory
Subject: OpenServer 5.0.5 OpenServer 5.0.6 OpenServer 5.0.7 : remote buffer overflow in sendmail (CERT CA-2003-07)
Advisory number: CSSA-2003-SCO.6
Issue date: 2003 March 12
Cross reference:
______________________________________________________________________________
1. Problem Description
From CA-2003-07: Researchers at Internet Security Systems
(ISS) have discovered a remotely exploitable vulnerability
in sendmail. This vulnerability could allow an intruder to
gain control of a vulnerable sendmail server.
2. Vulnerable Supported Versions
System Vulnerable Versions
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OpenServer 5.0.5 previous to sendmail 8.11.0a
OpenServer 5.0.6 previous to sendmail 8.11.0a
OpenServer 5.0.7 previous to sendmail 8.11.0a
3. Solution
The proper solution is to install the latest packages.
4. OpenServer 5.0.5
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.6
4.2 Verification
MD5 (sendmail.506.tar) = da105d0a82313ed19bc10b515467e93f
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download the sendmail.506.tar file to the /tmp directory
(OpenServer 5.0.5 uses the 5.0.6 tar image)
2) Extract the files from the tar archive:
cd /tmp; tar xvf sendmail.506.tar
3) Run the custom command, specify an install from media
images, and specify the /tmp directory as the location of
the images.
5. OpenServer 5.0.6
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.6
5.2 Verification
MD5 (sendmail.506.tar) = da105d0a82313ed19bc10b515467e93f
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
5.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download the sendmail.506.tar file to the /tmp directory
2) Extract the files from the tar archive:
cd /tmp; tar xvf sendmail.506.tar
3) Run the custom command, specify an install from media
images, and specify the /tmp directory as the location of
the images.
6. OpenServer 5.0.7
6.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.6
6.2 Verification
MD5 (sendmail.507.tar) = 807f1fa8d15a3361a589119bfca18533
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
6.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download the sendmail.507.tar file to the /tmp directory
2) Extract the files from the tar archive:
cd /tmp; tar xvf sendmail.507.tar
3) Run the custom command, specify an install from media
images, and specify the /tmp directory as the location of
the images.
7. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1337
http://www.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21950
http://www.cert.org/advisories/CA-2003-07.html
http://www.kb.cert.org/vuls/id/398025
http://www.sendmail.org/8.12.8.html
SCO security resources:
http://www.sco.com/support/security/index.html
This security fix closes SCO incidents sr875284, fz527484,
erg712247.
8. Disclaimer
SCO is not responsible for the misuse of any of the information
we provide on this website and/or through our security
advisories. Our advisories are a service to our customers
intended to promote secure installation and use of SCO
products.
9. Acknowledgements
Internet Security Systems, Inc. discovered and researched
this vulnerability.
______________________________________________________________________________
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