CVE-2020-28374 log

Severity Medium
Remote No
Type Directory traversal
In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking in the LIO SCSI target code can be used by remote attackers to read or write files via directory traversal in an XCOPY request, aka CID-2896c93811e3. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. The attacker gains control over file access because I/O operations are proxied via an attacker-selected backstore.
Group Package Affected Fixed Severity Status Ticket
AVG-1445 linux-lts 5.4.88-1 5.4.89-1 Medium Fixed
AVG-1444 linux-zen 5.10.6.zen1-1 5.10.7.zen1-1 Medium Fixed
AVG-1443 linux-hardened 5.10.6.a-1 5.10.7.a-1 Medium Fixed
AVG-1442 linux 5.10.6.arch1-1 5.10.7.arch1-1 Medium Fixed
Date Advisory Group Package Severity Type
20 Jan 2021 ASA-202101-33 AVG-1442 linux Medium directory traversal
20 Jan 2021 ASA-202101-32 AVG-1443 linux-hardened Medium directory traversal
20 Jan 2021 ASA-202101-31 AVG-1444 linux-zen Medium directory traversal
20 Jan 2021 ASA-202101-30 AVG-1445 linux-lts Medium directory traversal

The issue can be mitigated by disabling XCOPY support:

# echo 0 > /sys/kernel/config/target/core/<backstore>/<name>/attrib/emulate_3pc