CVE-2019-11191

Ubuntu Security Notice USN-4006-2

Severity Score

2.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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

** EN DISPUTA ** En el kernel de Linux hasta de la versión 5.0.7, cuando CONFIG_IA32_AOUT está habilitado y ia32_aout está cargado, permite a los usuarios locales omitir ASLR en programas setuid a.out (si existe) porque install_exec_creds() es llamado demasiado tarde en load_aout_binary() en fs/binfmt_aout .c, y por lo tanto la comprobación ptrace_may_access() tiene una condición de carrera cuando se lee /proc/pid/stat. NOTA: el mantenedor de software discute que se trate de una vulnerabilidad porque ASLR para un archivo ejecutable de formato nunca fue compatible.

USN-4007-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS. Federico Manuel Bento discovered that the Linux kernel did not properly apply Address Space Layout Randomization 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. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-04-11 CVE Reserved
2019-04-11 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CAPEC

References (12)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2019/04/18/5	Mailing List
http://www.openwall.com/lists/oss-security/2019/05/22/7	Mailing List
http://www.securityfocus.com/bid/107887	Third Party Advisory

URL	Date	SRC
https://www.openwall.com/lists/oss-security/2019/04/03/4	2024-08-04
https://www.openwall.com/lists/oss-security/2019/04/03/4/1	2024-08-04

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html	2024-05-17
https://usn.ubuntu.com/4006-1	2024-05-17
https://usn.ubuntu.com/4006-2	2024-05-17
https://usn.ubuntu.com/4007-1	2024-05-17
https://usn.ubuntu.com/4007-2	2024-05-17
https://usn.ubuntu.com/4008-1	2024-05-17
https://usn.ubuntu.com/4008-3	2024-05-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 5.0.7 Search vendor "Linux" for product "Linux Kernel" and version " <= 5.0.7"		-		Affected