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AUSCERT External Security Bulletin Redistribution
ESB-2002.695 -- RHSA-2002:229-10
Updated wget packages fix directory traversal bug
12 December 2002
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AusCERT Security Bulletin Summary
---------------------------------
Product: wget
Vendor: Red Hat
Operating System: Red Hat Linux 6.2
Red Hat Linux 7.0
Red Hat Linux 7.1
Red Hat Linux 7.2
Red Hat Linux 7.3
Red Hat Linux 8.0
Platform: i386
IA-64
Impact: Create Arbitrary Files
Overwrite Arbitrary Files
Access Required: Existing Account
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Red Hat, Inc. Red Hat Security Advisory
Synopsis: Updated wget packages fix directory traversal bug
Advisory ID: RHSA-2002:229-10
Issue date: 2002-12-10
Updated on: 2002-12-04
Product: Red Hat Linux
Keywords: wget directory traversal ftp client flaw:dot
Cross references:
Obsoletes:
CVE Names: CAN-2002-1344
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1. Topic:
The wget packages shipped with Red Hat Linux 6.2 through 8.0 contain a
security bug which, under certain circumstances, can cause local files to
be written outside the download directory.
2. Relevant releases/architectures:
Red Hat Linux 6.2 - i386
Red Hat Linux 7.0 - i386
Red Hat Linux 7.1 - i386, ia64
Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
3. Problem description:
Versions of wget prior to 1.8.2-4 contain a bug that permits a malicious
FTP server to create or overwrite files anywhere on the local file system.
FTP clients must check to see if an FTP server's response to the NLST
command includes any directory information along with the list of filenames
required by the FTP protocol (RFC 959, section 4.1.3).
If the FTP client fails to do so, a malicious FTP server can send filenames
beginning with '/' or containing '/../' which can be used to direct a
vulnerable FTP client to write files (such as .forward, .rhosts, .shost,
etc.) that can then be used for later attacks against the client machine.
All Red Hat Linux users using wget < 1.8.2-4 should upgrade
to the errata packages which are not vulnerable to this issue.
Thanks to Steven M. Christey for his work in discovering this issue
in current FTP clients and for providing a patched FTP server to verify
the new packages.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.
Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:
up2date
This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.
5. RPMs required:
Red Hat Linux 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/wget-1.8.2-4.6x.src.rpm
i386:
ftp://updates.redhat.com/6.2/en/os/i386/wget-1.8.2-4.6x.i386.rpm
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/wget-1.8.2-4.70.src.rpm
i386:
ftp://updates.redhat.com/7.0/en/os/i386/wget-1.8.2-4.70.i386.rpm
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/wget-1.8.2-4.71.src.rpm
i386:
ftp://updates.redhat.com/7.1/en/os/i386/wget-1.8.2-4.71.i386.rpm
ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/wget-1.8.2-4.71.ia64.rpm
Red Hat Linux 7.2:
SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/wget-1.8.2-4.72.src.rpm
i386:
ftp://updates.redhat.com/7.2/en/os/i386/wget-1.8.2-4.72.i386.rpm
ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/wget-1.8.2-4.72.ia64.rpm
Red Hat Linux 7.3:
SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/wget-1.8.2-4.73.src.rpm
i386:
ftp://updates.redhat.com/7.3/en/os/i386/wget-1.8.2-4.73.i386.rpm
Red Hat Linux 8.0:
SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/wget-1.8.2-5.src.rpm
i386:
ftp://updates.redhat.com/8.0/en/os/i386/wget-1.8.2-5.i386.rpm
6. Verification:
MD5 sum Package Name
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2c06b1ab033d70ec287bb9c91a8daa68 6.2/en/os/SRPMS/wget-1.8.2-4.6x.src.rpm
fffbaeacd02411c23d011b1000f0ab49 6.2/en/os/i386/wget-1.8.2-4.6x.i386.rpm
8cfc796d3489f3d19d4af589bb73641b 7.0/en/os/SRPMS/wget-1.8.2-4.70.src.rpm
8c8abf8f81f057dbd74098b87fb9b54c 7.0/en/os/i386/wget-1.8.2-4.70.i386.rpm
5e022a0c2f4afe5285a5ed6b8abc0ee8 7.1/en/os/SRPMS/wget-1.8.2-4.71.src.rpm
229949e6fdde7a02f56999b4271bc5b1 7.1/en/os/i386/wget-1.8.2-4.71.i386.rpm
e24aba62d9589e0999678f880db6de08 7.1/en/os/ia64/wget-1.8.2-4.71.ia64.rpm
eefe85c57b07aa14522ab79a5c2f5607 7.2/en/os/SRPMS/wget-1.8.2-4.72.src.rpm
03ae8545b03f137b72b57dc2b2e91e22 7.2/en/os/i386/wget-1.8.2-4.72.i386.rpm
9f349807fbd8ecc7a2678af45e5d4ad1 7.2/en/os/ia64/wget-1.8.2-4.72.ia64.rpm
554d83dadce4e18f0c601c571d43564e 7.3/en/os/SRPMS/wget-1.8.2-4.73.src.rpm
20deb3f2c37f331e87a473fb1cac3d83 7.3/en/os/i386/wget-1.8.2-4.73.i386.rpm
2ab86f0e4955e8e5dc9bf37a4037bfcf 8.0/en/os/SRPMS/wget-1.8.2-5.src.rpm
efbebb343ded09fc553e5a34c75697f0 8.0/en/os/i386/wget-1.8.2-5.i386.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at http://www.redhat.com/about/contact/pgpkey.html
You can verify each package with the following command:
rpm --checksig -v <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
md5sum <filename>
7. References:
http://marc.theaimsgroup.com/?l=bugtraq&m=87602746719482
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1344
8. Contact:
The Red Hat security contact is <security@redhat.com>. More contact
details at http://www.redhat.com/solutions/security/news/contact.html
Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
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