Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2017-5551

Publication date 6 February 2017

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.4 · Medium

Score breakdown

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.

From the Ubuntu Security Team

It was discovered that the Linux kernel did not clear the setgid bit during a setxattr call on a tmpfs filesystem. A local attacker could use this to gain elevated group privileges.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Fixed 4.8.0-59.64
16.04 LTS xenial
Fixed 4.4.0-67.88
14.04 LTS trusty
Not affected
12.04 LTS precise
Not affected
linux-armadaxp 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise
Not affected
linux-aws 18.04 LTS bionic
Not affected
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Fixed 4.4.0-1009.18
14.04 LTS trusty
Not affected
12.04 LTS precise Not in release
linux-azure 18.04 LTS bionic
Not affected
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
linux-euclid 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-gcp 18.04 LTS bionic
Not affected
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-gke 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-goldfish 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-grouper 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-hwe 18.04 LTS bionic
Not affected
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Fixed 4.10.0-27.30~16.04.2
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-hwe-edge 18.04 LTS bionic
Fixed 4.18.0-8.9~18.04.1
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Fixed 4.10.0-27.30~16.04.2
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-kvm 18.04 LTS bionic
Not affected
17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-linaro-omap 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-linaro-shared 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-linaro-vexpress 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-quantal 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-raring 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-saucy 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-trusty 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise
Not affected
linux-lts-utopic 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-lts-vivid 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-lts-wily 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-lts-xenial 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
Fixed 4.4.0-67.88~14.04.1
12.04 LTS precise Not in release
linux-maguro 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-mako 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-manta 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-oem 18.04 LTS bionic
Not affected
17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-qcm-msm 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-raspi2 18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Fixed 4.8.0-1043.47
16.04 LTS xenial
Fixed 4.4.0-1048.55
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-snapdragon 18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Fixed 4.4.0-1055.59
16.10 yakkety
Fixed 4.4.0-1055.59
16.04 LTS xenial
Fixed 4.4.0-1051.55
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-ti-omap4 18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
12.04 LTS precise
Not affected

Notes

jdstrand

android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 4.4 · Medium
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-3361-1
    • Linux kernel (HWE) vulnerabilities
    • 21 July 2017
    • USN-3234-2
    • Linux kernel (Xenial HWE) vulnerabilities
    • 15 March 2017
    • USN-3359-1
    • Linux kernel vulnerabilities
    • 20 July 2017
    • USN-3234-1
    • Linux kernel vulnerabilities
    • 15 March 2017

Other references