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CVE-2019-11191

Publication date 11 April 2019

Last updated 24 July 2024

Ubuntu priority

Negligible

Why this priority?

Cvss 3 Severity Score

2.5 · Low

Score breakdown

** DISPUTED ** The Linux kernel through 5.0.7, when CONFIG_IA32_AOUT is enabled and ia32_aout is loaded, allows local users to bypass ASLR on setuid a.out programs (if any exist) because install_exec_creds() is called too late in load_aout_binary() in fs/binfmt_aout.c, and thus the ptrace_may_access() check has a race condition when reading /proc/pid/stat. NOTE: the software maintainer disputes that this is a vulnerability because ASLR for a.out format executables has never been supported.

From the Ubuntu Security Team

Federico Manuel Bento discovered that the Linux kernel did not properly apply Address Space Layout Randomization (ASLR) in some situations for setuid a.out binaries. A local attacker could use this to improve the chances of exploiting an existing vulnerability in a setuid a.out binary.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-21.22
18.04 LTS bionic
Fixed 4.15.0-51.55
16.04 LTS xenial
Fixed 4.4.0-150.176
14.04 LTS trusty Ignored
linux-aws 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1017.19
18.04 LTS bionic
Fixed 4.15.0-1040.42
16.04 LTS xenial
Fixed 4.4.0-1084.94
14.04 LTS trusty
linux-aws-hwe 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial
Fixed 4.15.0-1040.42~16.04.1
14.04 LTS trusty Not in release
linux-azure 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1019.19
18.04 LTS bionic
Fixed 4.18.0-1019.19~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1046.50
14.04 LTS trusty Ignored
linux-azure-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-1019.19~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1046.50
14.04 LTS trusty Not in release
linux-euclid 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gcp 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1012.13
18.04 LTS bionic
Fixed 4.15.0-1033.35
16.04 LTS xenial
Fixed 4.15.0-1033.35~16.04.1
14.04 LTS trusty Not in release
linux-gcp-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.15.0-1033.35
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gke-4.15 19.04 disco Not in release
18.04 LTS bionic
Fixed 4.15.0-1033.35
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.0 19.04 disco Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-goldfish 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-grouper 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-21.22~18.04.1
16.04 LTS xenial
Fixed 4.15.0-51.55~16.04.1
14.04 LTS trusty Not in release
linux-hwe-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial
Fixed 4.15.0-51.55~16.04.1
14.04 LTS trusty Not in release
linux-kvm 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1013.13
18.04 LTS bionic
Fixed 4.15.0-1035.35
16.04 LTS xenial
Fixed 4.4.0-1047.53
14.04 LTS trusty Not in release
linux-lts-trusty 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-utopic 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-lts-vivid 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-lts-wily 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-lts-xenial 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
linux-maguro 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-mako 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-manta 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oem 19.04 disco
Fixed 4.15.0-1039.44
18.10 cosmic
Fixed 4.15.0-1039.44
18.04 LTS bionic
Fixed 4.15.0-1039.44
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-oracle 19.04 disco
Fixed 4.15.0-1014.16
18.10 cosmic
Fixed 4.15.0-1014.16
18.04 LTS bionic
Fixed 4.15.0-1014.16
16.04 LTS xenial
Fixed 4.15.0-1014.16~16.04.1
14.04 LTS trusty Not in release
linux-raspi2 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1015.17
18.04 LTS bionic
Fixed 4.15.0-1037.39
16.04 LTS xenial
Fixed 4.4.0-1110.118
14.04 LTS trusty Not in release
linux-snapdragon 19.04 disco
Not affected
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.15.0-1054.58
16.04 LTS xenial
Fixed 4.4.0-1114.119
14.04 LTS trusty Not in release

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Notes

tyhicks

This only affects i386 Ubuntu kernels. Additionally, it is very unlikely that systems will have a setuid a.out program installed.

sbeattie

configuration changes to disable i386 a.out support are in progress.

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 2.5 · Low
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-4008-1
    • Linux kernel vulnerabilities
    • 4 June 2019
    • USN-4007-1
    • Linux kernel vulnerability
    • 4 June 2019
    • USN-4006-2
    • Linux kernel (HWE) vulnerability
    • 4 June 2019
    • USN-4007-2
    • Linux kernel (HWE) vulnerability
    • 4 June 2019
    • USN-4006-1
    • Linux kernel vulnerability
    • 4 June 2019
    • USN-4008-3
    • Linux kernel (Xenial HWE) vulnerabilities
    • 7 June 2019

Other references