CVE-2019-11191
Published: 11 April 2019
** 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.
Notes
Author | Note |
---|---|
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. |
Priority
Status
Package | Release | Status |
---|---|---|
linux Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-51.55)
|
cosmic |
Released
(4.18.0-21.22)
|
|
disco |
Not vulnerable
(5.0.0-11.12)
|
|
trusty |
Ignored
(was needed ESM criteria)
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.4.0-150.176)
|
|
Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||
linux-aws Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1040.42)
|
cosmic |
Released
(4.18.0-1017.19)
|
|
disco |
Not vulnerable
(5.0.0-1002.2)
|
|
trusty |
Released
(4.4.0-1045.48)
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.4.0-1084.94)
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-1040.42~16.04.1)
|
|
linux-azure Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-1019.19~18.04.1)
|
cosmic |
Released
(4.18.0-1019.19)
|
|
disco |
Not vulnerable
(5.0.0-1002.2)
|
|
trusty |
Ignored
(was needed ESM criteria)
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-1046.50)
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-1019.19~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-1046.50)
|
|
linux-euclid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Ignored
(was needs-triage ESM criteria)
|
|
linux-flo Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Ignored
(abandoned)
|
|
linux-gcp Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1033.35)
|
cosmic |
Released
(4.18.0-1012.13)
|
|
disco |
Not vulnerable
(5.0.0-1002.2)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-1033.35~16.04.1)
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1033.35)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-gke Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Ignored
(end-of-life)
|
|
linux-gke-4.15 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1033.35)
|
disco |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-gke-5.0 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.0.0-1011.11~18.04.1)
|
disco |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-goldfish Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Ignored
(end-of-life)
|
|
linux-grouper Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-hwe Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-21.22~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-51.55~16.04.1)
|
|
linux-hwe-edge Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.0.0-15.16~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-51.55~16.04.1)
|
|
linux-kvm Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1035.35)
|
cosmic |
Released
(4.18.0-1013.13)
|
|
disco |
Not vulnerable
(5.0.0-1002.2)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.4.0-1047.53)
|
|
linux-lts-trusty Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [end-of-life])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-lts-vivid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [end-of-life])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-lts-wily Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [end-of-life])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Released
(4.4.0-150.176~14.04.1)
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-maguro Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-mako Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Ignored
(abandoned)
|
|
linux-manta Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Does not exist
|
|
linux-oem Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1039.44)
|
cosmic |
Released
(4.15.0-1039.44)
|
|
disco |
Released
(4.15.0-1039.44)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Ignored
(was needs-triage now end-of-life)
|
|
linux-oracle Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1014.16)
|
cosmic |
Released
(4.15.0-1014.16)
|
|
disco |
Released
(4.15.0-1014.16)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.15.0-1014.16~16.04.1)
|
|
linux-raspi2 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1037.39)
|
cosmic |
Released
(4.18.0-1015.17)
|
|
disco |
Not vulnerable
(5.0.0-1005.5)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.4.0-1110.118)
|
|
linux-snapdragon Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1054.58)
|
cosmic |
Does not exist
|
|
disco |
Not vulnerable
(5.0.0-1010.10)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1~rc1)
|
|
xenial |
Released
(4.4.0-1114.119)
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 2.5 |
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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11191
- https://www.openwall.com/lists/oss-security/2019/04/03/4
- https://www.openwall.com/lists/oss-security/2019/04/03/4/1
- https://ubuntu.com/security/notices/USN-4006-1
- https://ubuntu.com/security/notices/USN-4006-2
- https://ubuntu.com/security/notices/USN-4007-1
- https://ubuntu.com/security/notices/USN-4007-2
- https://ubuntu.com/security/notices/USN-4008-1
- https://ubuntu.com/security/notices/USN-4008-3
- NVD
- Launchpad
- Debian