Vulnerability Details : CVE-2021-27363
Potential exploit
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.
Products affected by CVE-2021-27363
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27363
0.02%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 3 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27363
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.6
|
LOW | AV:L/AC:L/Au:N/C:P/I:N/A:P |
3.9
|
4.9
|
NIST | |
|
4.4
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L |
1.8
|
2.5
|
NIST |
References for CVE-2021-27363
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
[SECURITY] [DLA 2586-1] linux security updateMailing List;Third Party Advisory
-
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
Kernel Live Patch Security Notice LSN-0075-1 ≈ Packet StormThird Party Advisory;VDB Entry
-
https://security.netapp.com/advisory/ntap-20210409-0001/
March 2021 Linux Kernel 5.11.3 Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
kernel/git/torvalds/linux.git - Linux kernel source treeMailing List;Patch;Vendor Advisory
-
https://bugzilla.suse.com/show_bug.cgi?id=1182716
Bug 1182716 – VUL-0: CVE-2021-27363: kernel-source: show_transport_handle() shows iSCSI transport handle to non-root usersIssue Tracking;Third Party Advisory
-
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
New Old Bugs in the Linux KernelExploit;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
[SECURITY] [DLA 2610-1] linux-4.19 security updateThird Party Advisory
-
http://www.openwall.com/lists/oss-security/2021/03/06/1
oss-security - Linux iscsi security fixesMailing List;Patch;Third Party Advisory
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