(Red Hat Issues Fix) Linux Kernel binfmt_elf Loader Lets Local Users Obtain Root Access
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SecurityTracker Alert ID: 1014009
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SecurityTracker URL: http://securitytracker.com/id?1014009
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CVE Reference: CAN-2004-1070
(Links to External Site)
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Date: May 19 2005
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Impact: Execution of arbitrary code via local system, Root access via local system
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Fix Available: Yes
Vendor Confirmed: Yes
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Advisory: Red Hat Advisory
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Version(s): 3
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Description: Some vulnerabilities were reported in the Linux kernel in the binfmt_elf loader. A local user can obtain root privileges on the target system.
Paul Starzetz reported several flaws in the ELF loader in the processing of set user id (setuid) binaries. These flaws include incorrect
return value validation in the load_elf_binary() function, some faulty error handling, and an unterminated string bug in 'binfmt_elf.c'
and also a file-type validation bug in 'exec.c' that allows non-readable ELF binaries to be read.
A local user can exploit these
flaws to cause a setuid binary to execute arbitrary code.
The original advisory, including some demonstration exploit code, is
available at:
http://isec.pl/vulnerabilities/isec-0017-binfmt_elf.txt
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Impact: A local user can execute arbitrary code with setuid privileges to obtain root access on the target system.
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Solution: Red Hat has released a fix.
Red Hat Enterprise Linux AS version 3 Extras:
SRPMS:
ftp://updates.redhat.com/enterprise/3AS-LACD/en/os/SRPMS/ia32el-1.2-2.EL3.1.src.rpm
0a300b374292c20a6945d3a55d1f30dc ia32el-1.2-2.EL3.1.src.rpm
ia64:
de3aa390822b8db030bfd200655a3858 ia32el-1.2-2.EL3.1.ia64.rpm
Red
Hat Enterprise Linux ES version 3 Extras:
SRPMS:
ftp://updates.redhat.com/enterprise/3ES-LACD/en/os/SRPMS/ia32el-1.2-2.EL3.1.src.rpm
0a300b374292c20a6945d3a55d1f30dc
ia32el-1.2-2.EL3.1.src.rpm
ia64:
de3aa390822b8db030bfd200655a3858 ia32el-1.2-2.EL3.1.ia64.rpm
Red Hat Enterprise Linux
WS version 3 Extras:
SRPMS:
ftp://updates.redhat.com/enterprise/3WS-LACD/en/os/SRPMS/ia32el-1.2-2.EL3.1.src.rpm
0a300b374292c20a6945d3a55d1f30dc
ia32el-1.2-2.EL3.1.src.rpm
ia64:
de3aa390822b8db030bfd200655a3858 ia32el-1.2-2.EL3.1.ia64.rpm
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Vendor URL: www.kernel.org/ (Links to External Site)
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Cause: Access control error, Boundary error, Exception handling error, Input validation error
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Underlying OS: Linux (Red Hat Enterprise)
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Reported By: bugzilla@redhat.com
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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: Wed, 18 May 2005 11:02 -0400
From: bugzilla@redhat.com
Subject: [RHSA-2005:275-01] Low: ia32el security update
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- ---------------------------------------------------------------------
Red Hat Security Advisory
Synopsis: Low: ia32el security update
Advisory ID: RHSA-2005:275-01
Advisory URL: https://rhn.redhat.com/errata/RHSA-2005-275.html
Issue date: 2005-05-18
Updated on: 2005-05-18
Product: Red Hat Enterprise Linux Extras
CVE Names: CAN-2004-1072
- ---------------------------------------------------------------------
1. Summary:
An updated ia32el package that fixes several bugs is now available.
This update has been rated as having low security impact by the Red Hat
Security Response Team.
2. Relevant releases/architectures:
Red Hat Enterprise Linux AS version 3 Extras - ia64
Red Hat Enterprise Linux ES version 3 Extras - ia64
Red Hat Enterprise Linux WS version 3 Extras - ia64
3. Problem description:
The ia32el package contains IA-32 Execution Layer platform which allows
emulation of IA-32 binaries on IA-64.
A flaw was found in the binfmt_elf loader of the Linux kernel which also
affects the IA-32 Execution Layer. A local user could create an
interpreter name string that is not NULL terminated, leading to a denial of
service (crash). The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2004-1072 to this issue.
This update also addresses the following issues:
- -- Fixed execve to invoke ia32 interpreter
- -- Credential fixes
- -- Fixed a bug causing ibm-jvm to fail
- -- Other minor bug fixes
Please refer to the package release notes for detailed information about
these changes.
All users of ia32el should upgrade to this updated package, which
resolves these issues.
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 Enterprise Linux AS version 3 Extras:
SRPMS:
ftp://updates.redhat.com/enterprise/3AS-LACD/en/os/SRPMS/ia32el-1.2-2.EL3.1.src.rpm
0a300b374292c20a6945d3a55d1f30dc ia32el-1.2-2.EL3.1.src.rpm
ia64:
de3aa390822b8db030bfd200655a3858 ia32el-1.2-2.EL3.1.ia64.rpm
Red Hat Enterprise Linux ES version 3 Extras:
SRPMS:
ftp://updates.redhat.com/enterprise/3ES-LACD/en/os/SRPMS/ia32el-1.2-2.EL3.1.src.rpm
0a300b374292c20a6945d3a55d1f30dc ia32el-1.2-2.EL3.1.src.rpm
ia64:
de3aa390822b8db030bfd200655a3858 ia32el-1.2-2.EL3.1.ia64.rpm
Red Hat Enterprise Linux WS version 3 Extras:
SRPMS:
ftp://updates.redhat.com/enterprise/3WS-LACD/en/os/SRPMS/ia32el-1.2-2.EL3.1.src.rpm
0a300b374292c20a6945d3a55d1f30dc ia32el-1.2-2.EL3.1.src.rpm
ia64:
de3aa390822b8db030bfd200655a3858 ia32el-1.2-2.EL3.1.ia64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package
6. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1072
7. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2005 Red Hat, Inc.
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