CVE-2021-27363

 

Published at: - 07-03-2021 05:15

Last modified: - 26-10-2022 01:44

Total changes: - 9

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

 

Verification logic

 

Reference

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
• http://www.openwall.com/lists/oss-security/2021/03/06/1
• https://bugzilla.suse.com/show_bug.cgi?id=1182716
• [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
• [debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update-Third Party Advisory
• http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
• https://security.netapp.com/advisory/ntap-20210409-0001/

 

Keywords

NVD

 

CVE-2021-27363

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures