UBUNTU-CVE-2019-11191

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UBUNTU-CVE-2019-11191

Summary:

Details: 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: https://ubuntu.com/security/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, https://www.cve.org/CVERecord?id=CVE-2019-11191