Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : uudecode performs inadequate checks on user-specified output files
Advisory number: CSSA-2002-SCO.44
Issue date: 2002 December 11
Cross reference:
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1. Problem Description
From CERT VU#336083:
If an attacker can convince a user to invoke uudecode on a
malicious file without reviewing the included file name, the
attacker can cause the user to overwrite any file accessible
by the user. If the victim user has root privileges, the
attacker can exploit this vulnerability to overwrite
arbitrary files. With respect to symbolic links and named
pipes, attackers who exploit this vulnerability can alter the
normal operation of system scripts and running processes,
significantly increasing the risk of system compromise.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
UnixWare 7.1.1 /usr/bin/uudecode
Open UNIX 8.0.0 /usr/bin/uudecode
3. Solution
The proper solution is to install the latest packages.
This security fix closes SCO incidents sr866875, fz521051,
erg712093.
7. 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.
8. Acknowledgements
AERAsec discovered and researched this vulnerability.
________________________________________________________________________
______
SCO Security Advisory
Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : uudecode performs inadequate checks on user-specified output files
Advisory number: CSSA-2002-SCO.44
Issue date: 2002 December 11
Cross reference:
________________________________________________________________________
______
1. Problem Description
From CERT VU#336083:
If an attacker can convince a user to invoke uudecode on a
malicious file without reviewing the included file name, the
attacker can cause the user to overwrite any file accessible
by the user. If the victim user has root privileges, the
attacker can exploit this vulnerability to overwrite
arbitrary files. With respect to symbolic links and named
pipes, attackers who exploit this vulnerability can alter the
normal operation of system scripts and running processes,
significantly increasing the risk of system compromise.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
UnixWare 7.1.1 /usr/bin/uudecode
Open UNIX 8.0.0 /usr/bin/uudecode
3. Solution
The proper solution is to install the latest packages.
4. UnixWare 7.1.1
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.44
4.2 Verification
MD5 (erg712093.pkg.Z) = e893c7c27e181a576fa2289ee807884d
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 erg712093.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg712093.pkg.Z
# pkgadd -d /var/spool/pkg/erg712093.pkg
5. Open UNIX 8.0.0
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.44
5.2 Verification
MD5 (erg712093.pkg.Z) = e893c7c27e181a576fa2289ee807884d
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 erg712093.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg712093.pkg.Z
# pkgadd -d /var/spool/pkg/erg712093.pkg
6. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0178
http://www.kb.cert.org/vuls/id/336083
http://www.aerasec.de/security/index.html?id=ae-200204-033&lang=en
SCO security resources:
http://www.sco.com/support/security/index.html
This security fix closes SCO incidents sr866875, fz521051,
erg712093.
7. 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.
8. Acknowledgements
AERAsec discovered and researched this vulnerability.
________________________________________________________________________
______
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