Vulnerability CVE-2019-11191
Published: 2019-04-11   Modified: 2019-04-12

Description:
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.

Type:

CWE-362

CVSS2 => (AV:L/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
1.9/10
2.9/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Linux -> Linux kernel 

 References:
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
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