CVE-2021-27363

Severity

44%

Complexity

18%

Confidentiality

41%

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.

CVSS 3.1 Base Score 4.4. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L).

CVSS 2.0 Base Score 3.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:N/A:P).

Overview

Type

Linux

First reported 3 years ago

2021-03-07 04:15:00

Last updated 3 years ago

2021-04-09 09:15:00

Affected Software

Linux Kernel

Debian Linux 9.0

9.0

References

http://www.openwall.com/lists/oss-security/2021/03/06/1

https://bugzilla.suse.com/show_bug.cgi?id=1182716

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa

[debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update

http://www.openwall.com/lists/oss-security/2021/03/06/1

Mailing List, Patch, Third Party Advisory

https://bugzilla.suse.com/show_bug.cgi?id=1182716

Issue Tracking, Third Party Advisory

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa

Mailing List, Patch, Vendor Advisory

[debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update

Mailing List, Third Party Advisory

https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html

https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html

Exploit, Third Party Advisory

[debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update

http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html

https://security.netapp.com/advisory/ntap-20210409-0001/

Stay updated

ExploitPedia is constantly evolving. Sign up to receive a notification when we release additional functionality.

Get in touch

If you'd like to report a bug or have any suggestions for improvements then please do get in touch with us using this form. We will get back to you as soon as we can.