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CVE-2018-1000204

5.3 · MEDIUM

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.

Published Jun 26, 2018EPSS 1.91%

Overview

CVE-2018-1000204 is a medium-severity vulnerability. It was published on June 26, 2018 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-05/msg00043.htmlRefwww.openwall.com/lists/oss-security/2018/06/26/3Refaccess.redhat.com/errata/RHSA-2018:2948GitHubgithub.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824Reflists.debian.org/debian-lts-announce/2018/07/msg00015.htmlReflists.debian.org/debian-lts-announce/2018/07/msg00016.htmlReflists.debian.org/debian-lts-announce/2018/07/msg00020.htmlRefusn.ubuntu.com/3696-1/Refusn.ubuntu.com/3696-2/Refusn.ubuntu.com/3752-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-1000204?

CVE-2018-1000204 is a medium-severity vulnerability. It was published on June 26, 2018 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2018-1000204?

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-1000204?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-1000204?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-1000204 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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