National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-5551 Detail

Current Description

The simple_set_acl function in fs/posix_acl.c in the Linux kernel before 4.9.6 preserves the setgid bit during a setxattr call involving a tmpfs filesystem, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-7097.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 4.4 MEDIUM
Vector: AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N (V3 legend)
Impact Score: 2.5
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): Low
Integrity (I): Low
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 3.6 LOW
Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:N) (V2 legend)
Impact Subscore: 4.9
Exploitability Subscore: 3.9


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

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=497de07d89c1410d76a15bec2bb41f24a2a89f31 Issue Tracking Patch Third Party Advisory
http://www.debian.org/security/2017/dsa-3791
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6 Release Notes Vendor Advisory
http://www.openwall.com/lists/oss-security/2017/01/21/3 Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/95717 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1038053
https://bugzilla.redhat.com/show_bug.cgi?id=1416126 Issue Tracking Patch
https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31 Issue Tracking Patch Third Party Advisory

Technical Details

Vulnerability Type (View All)

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

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (including)
4.9.5


Change History

4 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-5551
NVD Published Date:
02/06/2017
NVD Last Modified:
11/03/2017