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Red Hat 6: RHSA-2011:1088-01 Moderate SystemTap Escalation Threat

red hat
Calendar Grey July 25, 2011
Scroller Redhat Esm H88
Essential system enhancement for SystemTap on Red Hat Enterprise Linux rectifying two critical security vulnerabilities.
Updated systemtap packages that fix two security issues are now available for Red Hat Enterprise Linux 6

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

Summary

SystemTap is an instrumentation system for systems running the Linux kernel. The system allows developers to write scripts to collect data on the operation of the system.
It was found that SystemTap did not perform proper module path sanity checking if a user specified a custom path to the uprobes module, used when performing user-space probing ("staprun -u"). A local user who is a member of the stapusr group could use this flaw to bypass intended module-loading restrictions, allowing them to escalate their privileges by loading an arbitrary, unsigned module. (CVE-2011-2502)
A race condition flaw was found in the way the staprun utility performed module loading. A local user who is a member of the stapusr group could use this flaw to modify a signed module while it is being loaded, allowing them to escalate their privileges. (CVE-2011-2503)
SystemTap users should upgrade to these updated packages, which contain backported patches to correct these issues.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat privilege escalation module loading systemtap

References

https://access.redhat.com/security/cve/CVE-2011-2502 https://access.redhat.com/security/cve/CVE-2011-2503 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: systemtap-1.4-6.el6_1.2.i686.rpm systemtap-client-1.4-6.el6_1.2.i686.rpm systemtap-debuginfo-1.4-6.el6_1.2.i686.rpm systemtap-grapher-1.4-6.el6_1.2.i686.rpm systemtap-initscript-1.4-6.el6_1.2.i686.rpm systemtap-runtime-1.4-6.el6_1.2.i686.rpm
x86_64: systemtap-1.4-6.el6_1.2.x86_64.rpm systemtap-client-1.4-6.el6_1.2.x86_64.rpm systemtap-debuginfo-1.4-6.el6_1.2.x86_64.rpm systemtap-grapher-1.4-6.el6_1.2.x86_64.rpm systemtap-initscript-1.4-6.el6_1.2.x86_64.rpm systemtap-runtime-1.4-6.el6_1.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386: systemtap-debuginfo-1.4-6.el6_1.2.i686.rpm systemtap-sdt-devel-1.4-6.el6_1.2.i686.rpm systemtap-server-1.4-6.el6_1.2.i686.rpm systemtap-testsuite-1.4-6.el6_1.2.i686.rpm
x86_64: systemtap-debuginfo-1.4-6.el6_1.2.i686.rpm systemtap-debuginfo-1.4-6.el6_1.2.x86_64.rpm systemtap-sdt-devel-1.4-6.el6_1.2.i686.rpm systemtap-sdt-devel-1.4-6.el6_1.2.x86_64.rpm systemtap-server-1.4-6.el6_1.2.x86_64.rpm systemtap-testsuite-1.4-6.el6_1.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: systemtap-1.4-6.el6_1.2.x86_64.rpm systemtap-client-1.4-6.el6_1.2.x86_64.rpm systemtap-debuginfo-1.4-6.el6_1.2.x86_64.rpm systemtap-initscript-1.4-6.el6_1.2.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2011:1088-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:1088.html
Issue date: 2011-07-25

Topic

Updated systemtap packages that fix two security issues are now availablefor Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat privilege escalation module loading systemtap

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

Bugs Fixed

716476 - CVE-2011-2502 systemtap: insufficient security check when loading uprobes kernel module

716489 - CVE-2011-2503 systemtap: signed module loading race condition

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