CVE-2019-11191

LOW

Description

** 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.

References

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html

http://www.openwall.com/lists/oss-security/2019/04/18/5

http://www.openwall.com/lists/oss-security/2019/05/22/7

http://www.securityfocus.com/bid/107887

https://usn.ubuntu.com/4006-1/

https://usn.ubuntu.com/4006-2/

https://usn.ubuntu.com/4007-1/

https://usn.ubuntu.com/4007-2/

https://usn.ubuntu.com/4008-1/

https://usn.ubuntu.com/4008-3/

https://www.openwall.com/lists/oss-security/2019/04/03/4

https://www.openwall.com/lists/oss-security/2019/04/03/4/1

Details

Source: MITRE

Published: 2019-04-12

Updated: 2019-06-17

Type: CWE-362

Risk Information

CVSS v2.0

Base Score: 1.9

Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 3.4

Severity: LOW

CVSS v3.0

Base Score: 2.5

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Impact Score: 1.4

Exploitability Score: 1

Severity: LOW