CVE-2018-1000204

 

Published at: - 26-06-2018 04:29

Last modified: - 26-10-2022 01:44

Total changes: - 2

Description

** DISPUTED ** 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."

Common Vulnerability Scoring System (CVSS)

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

 

Verification logic

 

Reference

• https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824
• http://www.openwall.com/lists/oss-security/2018/06/26/3
• USN-3696-2-Third Party Advisory
• USN-3696-1-Third Party Advisory
• [debian-lts-announce] 20180715 [SECURITY] [DLA 1422-2] linux security update-Third Party Advisory
• [debian-lts-announce] 20180714 [SECURITY] [DLA 1422-1] linux security update-Third Party Advisory
• [debian-lts-announce] 20180718 [SECURITY] [DLA 1423-1] linux-4.9 new package-Third Party Advisory
• USN-3754-1-Third Party Advisory
• USN-3752-2-Third Party Advisory
• USN-3752-1-Third Party Advisory
• USN-3752-3-Third Party Advisory
• RHSA-2018:2948-Third Party Advisory
• openSUSE-SU-2019:1407-

 

Keywords

NVD

 

CVE-2018-1000204

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures