Rapid7 Vulnerability & Exploit Database

Amazon Linux AMI: CVE-2021-27363: Security patch for kernel (ALAS-2021-1487)

Free InsightVM Trial No Credit Card Necessary
Watch Demo See how it all works
Back to Search

Amazon Linux AMI: CVE-2021-27363: Security patch for kernel (ALAS-2021-1487)

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:P/I:N/A:P)
Published
03/07/2021
Created
03/23/2021
Added
03/20/2021
Modified
10/14/2022

Description

An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2021-1487
  • CVE-2021-27363
  • USN-4883-1
  • USN-4887-1
  • USN-4889-1
  • USN-4901-1

insightVM

Advanced vulnerability management analytics and reporting.
Key Features
Free InsightVM Trial View All Features

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;