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AUSCERT External Security Bulletin Redistribution
ESB-2002.247 -- RHSA-2002:092-11
Buffer overflow in UW imap daemon
29 May 2002
AusCERT Security Bulletin Summary
Product: UW imapd version 2000c and previous
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
Impact: Execute Arbitrary Code/Commands
Access Required: Existing Account
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Red Hat, Inc. Red Hat Security Advisory
Synopsis: Buffer overflow in UW imap daemon
Advisory ID: RHSA-2002:092-11
Issue date: 2002-05-16
Updated on: 2002-05-22
Product: Red Hat Linux
Keywords: UW imap buffer overflow wu-imap uw-imap
CVE Names: CAN-2002-0379
The UW imap daemon contains a buffer overflow which allows a
logged in, remote user to execute commands on the server
with the user's UID/GID.
2. Relevant releases/architectures:
Red Hat Linux 6.2 - alpha, i386, sparc
Red Hat Linux 7.0 - alpha, i386
Red Hat Linux 7.1 - alpha, i386, ia64
Red Hat Linux 7.2 - i386, ia64
3. Problem description:
UW imapd is an IMAP daemon from the University of Washington. Version
2000c and previous versions have a bug that allows a malicious user to
construct a malformed request which overflows an internal buffer, enabling
that user to execute commands on the server with the user's UID/GID.
To exploit this problem the user has to have successfully authenticated to
the imapd service. Therefore, this vulnerability mainly affects free email
providers or mail servers where the user has no shell access to the system.
On other systems, in which the user already has shell access, users can
already run commands under their own UIDs/GIDs.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0379 to this issue.
Users of imapd are advised to upgrade to these errata packages containing
version 2001a of imapd. They are not vulnerable to this issue.
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
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:
This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
6. RPMs required:
Red Hat Linux 6.2:
Red Hat Linux 7.0:
Red Hat Linux 7.1:
Red Hat Linux 7.2:
MD5 sum Package Name
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
You can verify each package with the following command:
rpm --checksig <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:
rpm --checksig --nogpg <filename>
Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
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