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.
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.
https://www.openwall.com/lists/oss-security/2021/01/12/12 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.7&id=6f1e88527c1869de08632efa2cc796e0131850dc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.4.89&id=485e21729b1e1235e6075318225c09e76b376e81
Workaround ========== The issue can be mitigated by disabling XCOPY support: # echo 0 > /sys/kernel/config/target/core/<backstore>/<name>/attrib/emulate_3pc
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