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AUSCERT External Security Bulletin Redistribution
ESB-2000.291 -- Red Hat, Inc. Security Advisory
traceroute setuid root exploit with multiple -g options
17 October 2000
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AusCERT Security Bulletin Summary
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Product: traceroute
Vendor: Red Hat
Operating System: Red Hat Linux
Linux
Impact: Root Compromise
Denial of Service
Access Required: Local
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Red Hat, Inc. Security Advisory
Synopsis: traceroute setuid root exploit with multiple -g options
Advisory ID: RHSA-2000:078-02
Issue date: 2000-10-06
Updated on: 2000-10-06
Product: Red Hat Linux
Keywords: traceroute setuid root exploit
Cross references: N/A
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1. Topic:
a root exploit and several additional bugs in traceroute have been
corrected.
2. Relevant releases/architectures:
Red Hat Linux 5.0 - i386, alpha, sparc
Red Hat Linux 5.1 - i386, alpha, sparc
Red Hat Linux 5.2 - i386, alpha, sparc
Red Hat Linux 6.0 - i386, alpha, sparc
Red Hat Linux 6.1 - i386, alpha, sparc
Red Hat Linux 6.2 - i386, alpha, sparc
3. Problem description:
A root exploit due to a segfault when using multiple -g options is fixed
for Red Hat Linux 6.x and Red Hat Linux 5.x.
A potential denial-of-service attack is alleviated by enforcing a maximum
buffer size of 64Kb.
On Red Hat Linux 6.x, loose source routing (LSRR) now works correctly.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Fvh [filename]
where filename is the name of the RPM.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
18466 - traceroute: local root exploit now exists
13466 - segfault while parsing multiple -g arguments
15917 - Maksimum packetlength checked badly (Local DoS)
16281 - traceroute LSRR broken
6. RPMs required:
Red Hat Linux 5.x:
alpha:
ftp://updates.redhat.com/5.2/alpha/traceroute-1.4a5-24.5x.alpha.rpm
sparc:
ftp://updates.redhat.com/5.2/sparc/traceroute-1.4a5-24.5x.sparc.rpm
i386:
ftp://updates.redhat.com/5.2/i386/traceroute-1.4a5-24.5x.i386.rpm
sources:
ftp://updates.redhat.com/5.2/SRPMS/traceroute-1.4a5-24.5x.src.rpm
Red Hat Linux 6.x:
alpha:
ftp://updates.redhat.com/6.2/alpha/traceroute-1.4a5-24.6x.alpha.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/traceroute-1.4a5-24.6x.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/traceroute-1.4a5-24.6x.i386.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/traceroute-1.4a5-24.6x.src.rpm
7. Verification:
MD5 sum Package Name
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1fe1fb918271526d5d4e22046f1da776 5.2/SRPMS/traceroute-1.4a5-24.5x.src.rpm
25a92211082e65df9f89fd71ac7a6888 5.2/alpha/traceroute-1.4a5-24.5x.alpha.rpm
2fc1c66152f3fbd723b695472aadc0a6 5.2/i386/traceroute-1.4a5-24.5x.i386.rpm
d60c337c3fa3d23ba2c1cde082c8fee5 5.2/sparc/traceroute-1.4a5-24.5x.sparc.rpm
9fc2151d7cca01185add0ed085efcde0 6.2/SRPMS/traceroute-1.4a5-24.6x.src.rpm
f279d9e415a7d806daae86e8112fe8c6 6.2/alpha/traceroute-1.4a5-24.6x.alpha.rpm
49bd824f9f4784ce9c45fa54285c7aa0 6.2/i386/traceroute-1.4a5-24.6x.i386.rpm
498a1e08221e1d9e0115edb7f34ecef9 6.2/sparc/traceroute-1.4a5-24.6x.sparc.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/corp/contact.html
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>
8. References:
Thanks to Pekka Savola <pekkas@netcore.fi> for discovering the flaw.
See http://www.securityfocus.com/archive/1/136215 for a complete summary of
the flaw.
Copyright(c) 2000 Red Hat, Inc.
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