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RedHat: 'LPRng' excessive permission vulnerability Print E-mail
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Posted by Team   
RedHat Linux When LPRng drops uid and gid, it fails to drop membership in itssupplemental groups.

                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          LPRng fails to drop supplemental group membership
Advisory ID:       RHSA-2001:077-05
Issue date:        2001-06-07
Updated on:        2001-06-11
Product:           Red Hat Linux
Keywords:          LPRng groups
Cross references:  
Obsoletes:         RHBA-2001:039-05 RHSA-2000:065-06

1. Topic:

When LPRng drops uid and gid, it fails to drop membership in its
supplemental groups.

2. Relevant releases/architectures:

Red Hat Linux 7.0 - alpha, i386

Red Hat Linux 7.1 - i386

3. Problem description:

LPRng fails to drop supplemental group membership at init time, though it
does properly setuid and setgid. The result is that LPRng, and its
children, maintain any supplemental groups that the process starting LPRng
had at the time it started LPRng. This is a security risk.

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:


This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed  (http://bugzilla.Red for more info):

43341 - lpd fails to drop groups of root

6. RPMs required:

Red Hat Linux 7.0:




Red Hat Linux 7.1:



7. Verification:

MD5 sum                           Package Name
9a9a148f44c80cb83a1cc53b7fc60492 7.0/en/os/SRPMS/LPRng-3.7.4-23.src.rpm
3a83c1cdf9eef8bbc72bd511264a0fc3 7.0/en/os/alpha/LPRng-3.7.4-23.alpha.rpm
23e85c03c49b6d1eda0a76428f181dc5 7.0/en/os/i386/LPRng-3.7.4-23.i386.rpm
9a9a148f44c80cb83a1cc53b7fc60492 7.1/en/os/SRPMS/LPRng-3.7.4-23.src.rpm
23e85c03c49b6d1eda0a76428f181dc5 7.1/en/os/i386/LPRng-3.7.4-23.i386.rpm

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  

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:

Copyright(c) 2000, 2001 Red Hat, Inc.

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