National Vulnerability Database

National Vulnerability Database

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    Vulnerabilities Detail

CVE-2018-1000204 Detail

Current 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."

Source:  MITRE
Description Last Modified:  07/02/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 5.3 MEDIUM
Vector: AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N (V3 legend)
Impact Score: 3.6
Exploitability Score: 1.6

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 6.3 MEDIUM
Vector: (AV:N/AC:M/Au:S/C:C/I:N/A:N) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 6.8

Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): Single
Confidentiality (C): Complete
Integrity (I): None
Availability (A): None
Additional Information:
Allows unauthorized disclosure of information

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2018/06/26/3 Mailing List Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2948
https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html Third Party Advisory
https://usn.ubuntu.com/3696-1/ Third Party Advisory
https://usn.ubuntu.com/3696-2/ Third Party Advisory
https://usn.ubuntu.com/3752-1/
https://usn.ubuntu.com/3752-2/
https://usn.ubuntu.com/3752-3/
https://usn.ubuntu.com/3754-1/

Technical Details

Vulnerability Type (View All)

  • Permissions, Privileges, and Access Control (CWE-264)

Change History

8 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-1000204
NVD Published Date:
06/26/2018
NVD Last Modified:
10/31/2018