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AUSCERT Security Bulletin
ASB-2013.0056
Two vulnerabilities have been identified in Parallels Plesk Panel
16 April 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Parallels Plesk Panel
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2013-0133 CVE-2013-0132
Member content until: Thursday, May 16 2013
OVERVIEW
Two vulnerabilities have been identified in Parallels Plesk Panel
versions 11.x, 10.x for Linux and 9.x for UNIX/Linux. [1]
IMPACT
The vendor has provided the following details regarding these
vulnerabilities:
"Parallels Plesk Panel privilege escalation vulnerabilities have
been discovered and are described in VU#310500 and CVE-2013-0132,
CVE-2013-0133 (CVSS score 4.4 -
http://www.kb.cert.org/vuls/id/310500 )
The following versions of Parallels Plesk Panel for Linux are
confirmed to be vulnerable: 9.5, 10.x, 11.x. While there is no known
exploit for the above vulnerabilities, Parallels strongly recommends
to take action and apply security updates (or workaround) described
in this article." [1]
US-CERT has also provided the following details regarding these
issues:
"Plesk Panel contains multiple privilege escalation vulnerabilities
which may allow an attacker to run arbitrary code as the root user.
Special-case rules in Plesk's custom version of Apache suexec allow
execution of arbitrary code as an arbitrary user id above a certain
minimum value. In addition, several administrative or system
accounts have a user ID above this minimum.
* Plesk's /usr/sbin/suexec binary (the binary may be present in
additional locations, always with suexec in the filename) always
allows the binary 'cgi-wrapper', bypassing restrictions on the
ownership of the file to be called. Since cgi-wrapper's function is
to execute a PHP script based on environment variables (and suexec
does not sanitize these environment variables) this allows execution
of arbitrary PHP code with a user id above a minimum user ID value
that is hardcoded in the suid binary. CVE-2013-0132
* The program /usr/local/psa/admin/sbin/wrapper allows the user
psaadm to execute various administrative scripts with root
privileges. Some of these scripts call external programs without
specifying the full path. By specifying a malicious PATH environment
variable, an attacker can cause the administrative scripts to call
his own program instead of the intended system program.
CVE-2013-0133" [2]
MITIGATION
The vendor has stated that they are actively working on security
updates to correct these issues and have provided the following
details:
"* Plesk 11: fixed in MU#46 (shows up as Security fix – red – in all
Plesk 11s) - see KB115944 for more information
* Plesk 10.4.4: fixed in MU#49 (shows up as an Update – MU – in
Panel) - see KB115945 for more details
* Plesk 9.5.4: fixed in MU#28 - see KB115946 for more details
* Plesk 10.0.1: fixed in MU#18 - see KB115956 for more details
* Plesk 10.1.1: fixed in MU#24 - see KB115957 for more details
* Plesk 10.2.0: fixed in MU#19 - see KB115958 for more details
* Plesk 10.3.1: fixed in MU#20 - see KB115959 for more details" [1]
Additionally the vendor has provided the following workaround:
"Disable mod_php, mod_python and mod_perl and use Fast CGI and/or CGI,
which are not affected by this security vulnerability.
Below is the example on how to switch mod_php to fast_cgi for all
existent domains:
# mysql -uadmin --skip-column-names -p`cat /etc/psa/.psa.shadow` psa -e "select name from domains where htype = 'vrt_hst';" | awk -F \| '{print $1}' | while read a; do /usr/local/psa/bin/domain -u $a -php_handler_type fastcgi; done
After the fix for the issue is published Parallels still recommends
to avoid using these apache modules (mod_php, mod_python and
mod_perl) and instead use Fast CGI or CGI modes for improved
security on Apache." [1]
REFERENCES
[1] Public issues VU#310500 and CVE-2013-0132, CVE-2013-0133
http://kb.parallels.com/en/115942
[2] Vulnerability Note VU#310500
http://www.kb.cert.org/vuls/id/310500
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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