Bug 1930079 (CVE-2021-27363) - CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles
Summary: CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-27363
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1931358 1931359 1931360 1930807 1930808 1930809 1930810 1930811 1935903 1940415 1940416 1940417 1940418 1940419 1940420 1940421 1940422 1940423 1940424 1940425
Blocks: 1929972
TreeView+ depends on / blocked
 
Reported: 2021-02-18 10:33 UTC by msiddiqu
Modified: 2024-10-01 17:31 UTC (History)
47 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way access to sessions and handles was handled in the iSCSI driver in the Linux kernel. A local user could use this flaw to leak iSCSI transport handle kernel address or end arbitrary iSCSI connections on the system.
Clone Of:
Environment:
Last Closed: 2021-04-06 17:35:50 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2021:2494 0 None None None 2021-06-21 05:38:53 UTC

Description msiddiqu 2021-02-18 10:33:42 UTC 
A pointer leak was discovered in the linux kernel that can be used to determine the address of the iscsi_transport_structure.
Comment 1 Wade Mealing 2021-02-19 04:58:58 UTC 
Mitigation:

The LIBISCSI module will be auto-loaded when required, its use can be disabled  by preventing the module from loading with the following instructions:

# echo "install libiscsi /bin/true" >> /etc/modprobe.d/disable-libiscsi.conf

The system will need to be restarted if the libiscsi modules are loaded. In most circumstances, the libiscsi kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.

If the system requires iscsi to work correctly, this mitigation may not be suitable.

If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.
Comment 8 Petr Matousek 2021-03-05 18:58:49 UTC 
Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
Comment 9 Petr Matousek 2021-03-05 19:00:13 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1935903]
Comment 10 Petr Matousek 2021-03-06 16:53:28 UTC 
Acknowledgments:

Name: Adam Nichols (GRIMM)
Comment 11 Petr Matousek 2021-03-06 16:53:32 UTC 
External References:

https://www.openwall.com/lists/oss-security/2021/03/06/1
Comment 12 Justin M. Forbes 2021-03-09 16:55:08 UTC 
This was fixed for Fedora with the 5.10.21 stable kernel updates.
Comment 14 errata-xmlrpc 2021-04-06 07:55:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:1070 https://access.redhat.com/errata/RHSA-2021:1070
Comment 15 errata-xmlrpc 2021-04-06 09:28:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:1071 https://access.redhat.com/errata/RHSA-2021:1071
Comment 16 errata-xmlrpc 2021-04-06 13:58:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1081 https://access.redhat.com/errata/RHSA-2021:1081
Comment 17 errata-xmlrpc 2021-04-06 14:17:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1093 https://access.redhat.com/errata/RHSA-2021:1093
Comment 18 Product Security DevOps Team 2021-04-06 17:35:50 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-27363
Comment 20 errata-xmlrpc 2021-04-13 10:44:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:1171 https://access.redhat.com/errata/RHSA-2021:1171
Comment 21 errata-xmlrpc 2021-04-20 12:54:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support
  Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2021:1267 https://access.redhat.com/errata/RHSA-2021:1267
Comment 22 errata-xmlrpc 2021-04-20 13:02:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:1279 https://access.redhat.com/errata/RHSA-2021:1279
Comment 23 errata-xmlrpc 2021-04-20 13:16:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:1272 https://access.redhat.com/errata/RHSA-2021:1272
Comment 24 errata-xmlrpc 2021-04-20 15:33:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Advanced Update Support

Via RHSA-2021:1289 https://access.redhat.com/errata/RHSA-2021:1289
Comment 25 errata-xmlrpc 2021-04-27 06:51:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Advanced Update Support

Via RHSA-2021:1373 https://access.redhat.com/errata/RHSA-2021:1373
Comment 26 errata-xmlrpc 2021-04-27 08:31:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2021:1376 https://access.redhat.com/errata/RHSA-2021:1376
Comment 28 errata-xmlrpc 2021-05-11 12:30:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2021:1531 https://access.redhat.com/errata/RHSA-2021:1531
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