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Amazon Linux Local Check: ALAS-2015-476

Information

Severity

Severity

High

Family

Family

Amazon Linux Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.2

CVSSv2 Vector

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

7 years ago

Modified

Modified

4 years ago

Summary

Amazon Linux Local Security Checks

Insight

Insight

The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which allows local users to bypass intended file permissions by leveraging a POSIX ACL containing an entry for the group category that is more restrictive than the entry for the other category, aka a negative groups issue, related to kernel/groups.c, kernel/uid16.c, and kernel/user_namespace.c. (CVE-2014-8989 )A flaw was found in the way the Linux kernel's splice() system call validated its parameters. On certain file systems, a local, unprivileged user could use this flaw to write past the maximum file size, and thus crash the system. (CVE-2014-7822 )

Solution

Solution

Run yum clean all followed by yum update kernel to update your system. You will need to reboot your system in order for the new kernel to be running.

Common Vulnerabilities and Exposures (CVE)