Exploited
high
7.8
CWE
125 787 20
Advisory Published
CVE Published
Updated

CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

First published: Tue Nov 23 2021(Updated: )

The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation with administrative rights.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/polkit<0:0.96-11.el6_10.2
0:0.96-11.el6_10.2
redhat/polkit<0:0.112-26.el7_9.1
0:0.112-26.el7_9.1
redhat/polkit<0:0.112-12.el7_3.1
0:0.112-12.el7_3.1
redhat/polkit<0:0.112-12.el7_4.2
0:0.112-12.el7_4.2
redhat/polkit<0:0.112-18.el7_6.3
0:0.112-18.el7_6.3
redhat/polkit<0:0.112-22.el7_7.2
0:0.112-22.el7_7.2
redhat/polkit<0:0.115-13.el8_5.1
0:0.115-13.el8_5.1
redhat/polkit<0:0.115-9.el8_1.2
0:0.115-9.el8_1.2
redhat/polkit<0:0.115-11.el8_2.2
0:0.115-11.el8_2.2
redhat/polkit<0:0.115-11.el8_4.2
0:0.115-11.el8_4.2
redhat/redhat-virtualization-host<0:4.3.21-20220126.0.el7_9
0:4.3.21-20220126.0.el7_9
Red Hat Polkit
Polkit Project Polkit<121
Redhat Enterprise Linux Server Update Services For Sap Solutions=7.6
Redhat Enterprise Linux Server Update Services For Sap Solutions=7.7
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Eus=8.2
Redhat Enterprise Linux For Ibm Z Systems=7.0
Redhat Enterprise Linux For Ibm Z Systems=8.0
Redhat Enterprise Linux For Ibm Z Systems Eus=8.2
Redhat Enterprise Linux For Ibm Z Systems Eus=8.4
Redhat Enterprise Linux For Power Big Endian=7.0
Redhat Enterprise Linux For Power Little Endian=7.0
Redhat Enterprise Linux For Power Little Endian=8.0
Redhat Enterprise Linux For Power Little Endian Eus=8.1
Redhat Enterprise Linux For Power Little Endian Eus=8.2
Redhat Enterprise Linux For Power Little Endian Eus=8.4
Redhat Enterprise Linux For Scientific Computing=7.0
Redhat Enterprise Linux Server=6.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=7.3
Redhat Enterprise Linux Server Aus=7.4
Redhat Enterprise Linux Server Aus=7.6
Redhat Enterprise Linux Server Aus=7.7
Redhat Enterprise Linux Server Aus=8.2
Redhat Enterprise Linux Server Aus=8.4
Redhat Enterprise Linux Server Eus=8.4
Redhat Enterprise Linux Server Tus=7.6
Redhat Enterprise Linux Server Tus=7.7
Redhat Enterprise Linux Server Tus=8.2
Redhat Enterprise Linux Server Tus=8.4
Redhat Enterprise Linux Server Update Services For Sap Solutions=8.1
Redhat Enterprise Linux Server Update Services For Sap Solutions=8.2
Redhat Enterprise Linux Server Update Services For Sap Solutions=8.4
Redhat Enterprise Linux Workstation=7.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Canonical Ubuntu Linux=21.10
SUSE Enterprise Storage=7.0
SUSE Linux Enterprise High Performance Computing=15.0-sp2
Suse Manager Proxy=4.1
SUSE Manager Server=4.1
SUSE Linux Enterprise Desktop=15-sp2
SUSE Linux Enterprise Server=15-sp2
Suse Linux Enterprise Server Sap=15-sp2
Suse Linux Enterprise Workstation Extension=12-sp5
Oracle HTTP Server=12.2.1.3.0
Oracle HTTP Server=12.2.1.4.0
Oracle ZFS Storage Appliance Kit=8.8
Siemens Sinumerik Edge<3.3.0
Siemens Scalance Lpe9403 Firmware<2.0
Siemens Scalance Lpe9403
Starwindsoftware Command Center=1.0-update3_build5871
Starwindsoftware Starwind Hyperconverged Appliance
Starwindsoftware Starwind Virtual San=v8-build14338

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2025869

Remedy

https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683

Remedy

For customers who cannot update immediately and doesn't have Secure Boot feature enabled, the issue can be mitigated by executing the following steps: 1) Install required systemtap packages and dependencies as per - pointed by https://access.redhat.com/solutions/5441 2) Install polkit debug info: ~~~ debuginfo-install polkit ~~~ 3) Create the following systemtap script, and name it pkexec-block.stp: ~~~ probe process("/usr/bin/pkexec").function("main") { if (cmdline_arg(1) == "") raise(9); } ~~~ 4) Load the systemtap module into the running kernel: ~~~ stap -g -F -m stap_pkexec_block pkexec_block.stp ~~~ 5) Ensure the module is loaded: ~~~ lsmod | grep -i stap_pkexec_block stap_pkexec_block 434176 0 ~~~ 6) Once polkit package was updated to the version containing the fix, the systemtap generated kernel module can be removed by running: ~~~ rmmod stap_pkexec_block ~~~ This mitigation doesn't work for Secure Boot enabled system as SystemTap would require an external compiling server to be able to sign the generated kernel module with a key enrolled into the Kernel's keyring.

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