April 2005

ID: 00302
Ref: 280/2005
Date: 11 April 2005:14:18:30
Version: 1

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Title: SCO Security Advisory: SCOSA-2005.21 - UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 : telnet client multiple issues
Abstract: Buffer overflow in the slc_add_reply function in various BSD-based Telnet clients, when handling LINEMODE suboptions, allows remote attackers to execute arbitrary code via a reply with a large number of Set Local Character (SLC)commands.
Vendors affected: SCO
Operating systems affected: SCO
Applications affected: SCO

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Title
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SCO Security Advisory: SCOSA-2005.21 - UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 :
telnet client multiple issues

Detail
======

Buffer overflow in the slc_add_reply function in various BSD-based Telnet clients,
when handling LINEMODE suboptions, allows remote attackers to execute arbitrary code
via a reply with a large number of Set Local Character (SLC)commands.



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______________________________________________________________________________

SCO Security Advisory

Subject: UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 : telnet client
multiple issues
Advisory number: SCOSA-2005.21
Issue date: 2005 April 08
Cross reference: sr893210 fz531446 erg712801 CAN-2005-0469 CAN-2005-0468
______________________________________________________________________________


1. Problem Description

Buffer overflow in the slc_add_reply function in various
BSD-based Telnet clients, when handling LINEMODE suboptions,
allows remote attackers to execute arbitrary code via a
reply with a large number of Set Local Character (SLC)
commands.

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2005-0469 to this issue.

Heap-based buffer overflow in the env_opt_add function
in telnet.c for various BSD-based Telnet clients allows
remote attackers to execute arbitrary code via responses
that contain a large number of characters that require
escaping, which consumers more memory than allocated.

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2005-0468 to this issue.


2. Vulnerable Supported Versions

System Binaries
----------------------------------------------------------------------
UnixWare 7.1.4 /usr/bin/telnet
UnixWare 7.1.3 /usr/bin/telnet
UnixWare 7.1.1 /usr/bin/telnet


3. Solution

The proper solution is to install the latest packages.


4. UnixWare 7.1.4

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.21

4.2 Verification

MD5 (erg712801.714.pkg.Z) = bf53673ea12a1c25e3606a5b879adbc4

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:

Download erg712801.714.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712801.714.pkg.Z
# pkgadd -d /var/spool/pkg/erg712801.714.pkg


5. UnixWare 7.1.3

5.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.21

5.2 Verification

MD5 (erg712801.713.pkg.Z) = e876b261afbecb41c18c26d6ec11e71d

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:

Download erg712801.713.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712801.713.pkg.Z
# pkgadd -d /var/spool/pkg/erg712801.713.pkg


6. UnixWare 7.1.1

6.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.21

6.2 Verification

MD5 (erg712801.711.pkg.Z) = f3099416a793c1f731bc7e377fe0e4a2

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:

Download erg712801.711.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712801.711.pkg.Z
# pkgadd -d /var/spool/pkg/erg712801.711.pkg


7. References

Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
http://www.idefense.com/application/poi/display?id=221&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=220&type=vulnerabilities

SCO security resources:
http://www.sco.com/support/security/index.html

SCO security advisories via email
http://www.sco.com/support/forums/security.html

This security fix closes SCO incidents sr893210 fz531446
erg712801.


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. Acknowledgments

SCO would like to thank Gal Delalleau and iDEFENSE

______________________________________________________________________________

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