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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:

http://updates.redhat.com/5.2/alpha/traceroute-1.4a5-24.5x.alpha.rpm



sparc:

http://updates.redhat.com/5.2/sparc/traceroute-1.4a5-24.5x.sparc.rpm



i386:

http://updates.redhat.com/5.2/i386/traceroute-1.4a5-24.5x.i386.rpm



sources:

http://updates.redhat.com/5.2/SRPMS/traceroute-1.4a5-24.5x.src.rpm



Red Hat Linux 6.x:



alpha:

http://updates.redhat.com/6.2/alpha/traceroute-1.4a5-24.6x.alpha.rpm



sparc:

http://updates.redhat.com/6.2/sparc/traceroute-1.4a5-24.6x.sparc.rpm



i386:

http://updates.redhat.com/6.2/i386/traceroute-1.4a5-24.6x.i386.rpm



sources:

http://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  



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 



8. References:



Thanks to Pekka Savola  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.