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Scientific Linux Security Update : autofs on SL7.x x86_64 (20151119)
medium Nessus Plugin ID 87549
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
It was found that program-based automounter maps that used interpreted languages such as Python used standard environment variables to locate and load modules of those languages. A local attacker could potentially use this flaw to escalate their privileges on the system.(CVE-2014-8169)
Note: This issue has been fixed by adding the 'AUTOFS_' prefix to the affected environment variables so that they are not used to subvert the system. A configuration option ('force_standard_program_map_env') to override this prefix and to use the environment variables without the prefix has been added. In addition, warnings have been added to the manual page and to the installed configuration file. Now, by default the standard variables of the program map are provided only with the prefix added to its name.
Notably, this update fixes the following bugs :
- When the 'ls *' command was run in the root of an indirect mount, autofs attempted to literally mount the wildcard character (*) causing it to be added to the negative cache. If done before a valid mount, autofs then failed on further mount attempts inside the mount point, valid or not. This has been fixed, and wildcard map entries now function in the described situation.
- When autofs encountered a syntax error consisting of a duplicate entry in a multimap entry, it reported an error and did not mount the map entry. With this update, autofs has been amended to report the problem in the log to alert the system administrator and use the last seen instance of the duplicate entry rather than fail.
- In the ldap and sss lookup modules, the map reading functions did not distinguish between the 'no entry found' and 'service not available' errors. Consequently, when the 'service not available' response was returned from a master map read, autofs did not update the mounts. An 'entry not found' return does not prevent the map update, so the ldap and sss lookup modules were updated to distinguish between these two returns and now work as expected.
In addition, this update adds the following enhancement :
- The description of the configuration parameter map_hash_table_size was missing from the autofs.conf(5) man page and its description in the configuration file comments was insufficient. A description of the parameter has been added to autofs.conf(5), and the configuration file comments have been updated.
Solution
Update the affected autofs and / or autofs-debuginfo packages.See Also
Plugin Details
Severity: Medium
ID: 87549
File Name: sl_20151119_autofs_on_SL7_x.nasl
Version: 2.4
Type: local
Agent: unix
Published: 12/22/2015
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: Medium
Base Score: 4.4
Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:autofs, p-cpe:/a:fermilab:scientific_linux:autofs-debuginfo, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Patch Publication Date: 11/19/2015
Vulnerability Publication Date: 3/18/2015
Reference Information
CVE: CVE-2014-8169