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CentOS Linux: CVE-2018-1000204: Important: kernel-alt security, bug fix, and enhancement update (CESA-2018:2948)

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CentOS Linux: CVE-2018-1000204: Important: kernel-alt security, bug fix, and enhancement update (CESA-2018:2948)

Severity
6
CVSS
(AV:N/AC:M/Au:S/C:C/I:N/A:N)
Published
06/26/2018
Created
08/29/2019
Added
08/28/2019
Modified
11/08/2023

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 in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. 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. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it "virtually impossible to exploit.

Solution(s)

  • centos-upgrade-kernel

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