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CVE-2017-5551

Public on 2017-02-06
Modified on 2017-06-07
Description

A vulnerability was found in the Linux kernel in 'tmpfs' file system. When file permissions are modified via 'chmod' and the user is not in the owning group or capable of CAP_FSETID, the setgid bit is cleared in inode_change_ok(). Setting a POSIX ACL via 'setxattr' sets the file permissions as well as the new ACL, but doesn't clear the setgid bit in a similar way; this allows to bypass the check in 'chmod'.

Severity
Medium
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CVSS v3 Base Score
4.4
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2017-03-06 14:00 ALAS-2017-805

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.4 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD CVSSv2 3.6 AV:L/AC:L/Au:N/C:P/I:P/A:N
NVD CVSSv3 4.4 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N