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LIN6-14708 : Security Advisory - linux - CVE-2018-1000204

Created: Jun 29, 2018    Updated: Dec 16, 2018
Resolved Date: Nov 18, 2018
Found In Version: 6.0.0.37
Fix Version: 6.0.0.38
Severity: Standard
Applicable for: Wind River Linux 6
Component/s: Kernel

Description

Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream already: https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 The problem has limited scope, as users don't usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing `chmod o+r+w /dev/sg*` to make the devices accessible.

https://nvd.nist.gov/vuln/detail/CVE-2018-1000204

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