CVE-2019-11191: Race Condition
First published: Thu Apr 11 2019(Updated: )
** 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.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=5.0.7 | |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.119-1<=6.11.10-1<=6.12.5-1 |
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Reference Links
- 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
- https://launchpad.net/bugs/cve/CVE-2019-11191
- https://security-tracker.debian.org/tracker/CVE-2019-11191
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11191
- https://nvd.nist.gov/vuln/detail/CVE-2019-11191
- https://ubuntu.com/security/CVE-2019-11191
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