National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-13405 Detail

Current Description

The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.

Source:  MITRE
Description Last Modified:  07/16/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.8 HIGH
Vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 1.8


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

CVSS v2.0 Severity and Metrics:

Base Score: 4.6 MEDIUM
Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P) (V2 legend)
Impact Subscore: 6.4
Exploitability Subscore: 3.9


Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848c9c93c2c828ef4c3a8ca36ce46c7 Patch Vendor Advisory
http://openwall.com/lists/oss-security/2018/07/13/2 Mailing List Patch Third Party Advisory
https://github.com/torvalds/linux/commit/0fa3ecd87848c9c93c2c828ef4c3a8ca36ce46c7 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00014.html Third Party Advisory
https://twitter.com/grsecurity/status/1015082951204327425 Third Party Advisory
https://usn.ubuntu.com/3752-1/ Third Party Advisory
https://usn.ubuntu.com/3752-2/ Third Party Advisory
https://usn.ubuntu.com/3752-3/
https://usn.ubuntu.com/3753-1/ Third Party Advisory
https://usn.ubuntu.com/3753-2/ Third Party Advisory
https://usn.ubuntu.com/3754-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4266 Third Party Advisory
https://www.exploit-db.com/exploits/45033/ Exploit Third Party Advisory VDB Entry

Technical Details

Vulnerability Type (View All)

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

Change History

7 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-13405
NVD Published Date:
07/06/2018
NVD Last Modified:
08/29/2018