Synopsis

Low: sudo security and bug fix update

Type/Severity

Security Advisory: Low

Topic

An updated sudo package that fixes one security issue and various bugs is
now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

Description

The sudo (superuser do) utility allows system administrators to give
certain users the ability to run commands as root.

A flaw was found in the sudo password checking logic. In configurations
where the sudoers settings allowed a user to run a command using sudo
with only the group ID changed, sudo failed to prompt for the user's
password before running the specified command with the elevated group
privileges. (CVE-2011-0010)

In addition, this update fixes the following bugs:

• A NULL pointer dereference bug caused the sudo utility to terminate
  unexpectedly with a segmentation fault. This happened if the utility was
  run with the -g option and configured not to demand the password from the
  user who ran the sudo utility. With this update, the code has been modified
  and the problem no longer occurs. (BZ#673072)
  
• The sudo utility failed to load sudoers from an LDAP (Lightweight
  Directory Access Protocol) server after the sudo tool was upgraded. This
  happened because the upgraded nsswitch.conf file did not contain the
  instruction to search for sudoers on the LDAP server. This update adds the
  lost instruction to /etc/nsswitch.conf and the system searches for sources
  of sudoers on the local file system and then on LDAP, if applicable.
  (BZ#617061)
  
• The sudo tool interpreted a Runas alias specifying a group incorrectly as
  a user alias and the alias seemed to be ignored. With this update, the code
  for interpreting such aliases has been modified and the Runas group aliases
  are honored as expected. (BZ#627543)
  
• Prior to this update, sudo did not parse comment characters (#) in the
  ldap.conf file correctly and could fail to work. With this update, parsing
  of the LDAP configuration file has been modified and the comment characters
  are parsed correctly. (BZ#750318)
  
• The sudo utility formats its output to fit the width of the terminal
  window. However, this behavior is undesirable if the output is redirected
  through a pipeline. With this update, the output formatting is not applied
  in the scenario described. (BZ#697111)
  
• Previously, the sudo utility performed Security-Enhanced Linux (SELinux)
  related initialization after switching to an unprivileged user. This
  prevented the correct setup of the SELinux environment before executing the
  specified command and could potentially cause an access denial. The bug has
  been fixed by backporting the SELinux related code and the execution model
  from a newer version of sudo. (BZ#477185)
  
• On execv(3) function failure, the sudo tool executed an auditing call
  before reporting the failure. The call reset the error state and,
  consequently, the tool incorrectly reported that the command succeeded.
  With this update, the code has been modified and the problem no longer
  occurs. (BZ#673157)
  

All users of sudo are advised to upgrade to this updated package, which
resolves these issues.

Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 477185 - sudo changes uid before calling SELInux calls, preventing it from setting terminal context when using non priv account
• BZ - 627543 - The Runas_Spec are ignored in sudoers file
• BZ - 668879 - CVE-2011-0010 sudo: does not ask for password on GID changes
• BZ - 673072 - sudo segfault
• BZ - 673157 - sudo fails to report error correctly when execv(3) fails
• BZ - 697111 - sudo -l inserts new lines based on terminal width, causing errors when output is piped.

CVEs

• CVE-2011-0010

References

• https://access.redhat.com/security/updates/classification/#low

Red Hat Enterprise Linux Server 5

SRPM
sudo-1.7.2p1-13.el5.src.rpm	SHA-256: 8591b9bf8b0729c142401f9e00e879978046107a855a46793e583fc906b19267
x86_64
sudo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 390fd1aeb84db50a408acc87220c3eec5049c7731f7c0974d077b7a2ab63411e
sudo-debuginfo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 43e811c88d6a1d96365f4e6ab935fcd1d1a8a36f489c2424b29db228ce608e76
ia64
sudo-1.7.2p1-13.el5.ia64.rpm	SHA-256: a5f87f6ef03873b2d7135e78198a5d2ac9722946a1a298b2c61b420fc2ce4eee
sudo-debuginfo-1.7.2p1-13.el5.ia64.rpm	SHA-256: 4025818f7df289557214dfe6525c7af369d116057c21a8f89b8615037fb82dd7
i386
sudo-1.7.2p1-13.el5.i386.rpm	SHA-256: a3f6461ac16d15b2348304408c75a3240bcdb8f029f85207b63ec8c15ed70484
sudo-debuginfo-1.7.2p1-13.el5.i386.rpm	SHA-256: 2effc074b2bf1d0761daf015d8f8a0ad26fad06bf39f5268ed28b3e10dbedb36

Red Hat Enterprise Linux Workstation 5

SRPM
sudo-1.7.2p1-13.el5.src.rpm	SHA-256: 8591b9bf8b0729c142401f9e00e879978046107a855a46793e583fc906b19267
x86_64
sudo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 390fd1aeb84db50a408acc87220c3eec5049c7731f7c0974d077b7a2ab63411e
sudo-debuginfo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 43e811c88d6a1d96365f4e6ab935fcd1d1a8a36f489c2424b29db228ce608e76
i386
sudo-1.7.2p1-13.el5.i386.rpm	SHA-256: a3f6461ac16d15b2348304408c75a3240bcdb8f029f85207b63ec8c15ed70484
sudo-debuginfo-1.7.2p1-13.el5.i386.rpm	SHA-256: 2effc074b2bf1d0761daf015d8f8a0ad26fad06bf39f5268ed28b3e10dbedb36

Red Hat Enterprise Linux Desktop 5

SRPM
sudo-1.7.2p1-13.el5.src.rpm	SHA-256: 8591b9bf8b0729c142401f9e00e879978046107a855a46793e583fc906b19267
x86_64
sudo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 390fd1aeb84db50a408acc87220c3eec5049c7731f7c0974d077b7a2ab63411e
sudo-debuginfo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 43e811c88d6a1d96365f4e6ab935fcd1d1a8a36f489c2424b29db228ce608e76
i386
sudo-1.7.2p1-13.el5.i386.rpm	SHA-256: a3f6461ac16d15b2348304408c75a3240bcdb8f029f85207b63ec8c15ed70484
sudo-debuginfo-1.7.2p1-13.el5.i386.rpm	SHA-256: 2effc074b2bf1d0761daf015d8f8a0ad26fad06bf39f5268ed28b3e10dbedb36

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
sudo-1.7.2p1-13.el5.src.rpm	SHA-256: 8591b9bf8b0729c142401f9e00e879978046107a855a46793e583fc906b19267
s390x
sudo-1.7.2p1-13.el5.s390x.rpm	SHA-256: 476bfbb0e942135ef27e4e568274f62fb7a7bcd135839468898c0c07615f1d2a
sudo-debuginfo-1.7.2p1-13.el5.s390x.rpm	SHA-256: 4962a2860a8c888d47fcc471bd6433b6af215eacc371dce15fb0ee47f5ba817e

Red Hat Enterprise Linux for Power, big endian 5

SRPM
sudo-1.7.2p1-13.el5.src.rpm	SHA-256: 8591b9bf8b0729c142401f9e00e879978046107a855a46793e583fc906b19267
ppc
sudo-1.7.2p1-13.el5.ppc.rpm	SHA-256: 51079730bba1d2d60b6519f1d2f033786da1af50fdd25aab7253684cd555b5f0
sudo-debuginfo-1.7.2p1-13.el5.ppc.rpm	SHA-256: a73c32ab55e2038220ea1a567fa9a8dfba34689ebbbce2833a097a67447b5f98

Red Hat Enterprise Linux Server from RHUI 5

SRPM
sudo-1.7.2p1-13.el5.src.rpm	SHA-256: 8591b9bf8b0729c142401f9e00e879978046107a855a46793e583fc906b19267
x86_64
sudo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 390fd1aeb84db50a408acc87220c3eec5049c7731f7c0974d077b7a2ab63411e
sudo-debuginfo-1.7.2p1-13.el5.x86_64.rpm	SHA-256: 43e811c88d6a1d96365f4e6ab935fcd1d1a8a36f489c2424b29db228ce608e76
i386
sudo-1.7.2p1-13.el5.i386.rpm	SHA-256: a3f6461ac16d15b2348304408c75a3240bcdb8f029f85207b63ec8c15ed70484
sudo-debuginfo-1.7.2p1-13.el5.i386.rpm	SHA-256: 2effc074b2bf1d0761daf015d8f8a0ad26fad06bf39f5268ed28b3e10dbedb36