UBUNTU-CVE-2019-11191
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
02 / AFFECTED SOFTWARE
Affected packages
61 explicit affected versions
20 explicit affected versions
6 explicit affected versions
61 explicit affected versions
191 explicit affected versions
24 explicit affected versions
6 explicit affected versions
29 explicit affected versions
1 explicit affected versions
12 explicit affected versions
1 explicit affected versions
29 explicit affected versions
6 explicit affected versions
34 explicit affected versions
5 explicit affected versions
23 explicit affected versions
2 explicit affected versions
23 explicit affected versions
63 explicit affected versions
25 explicit affected versions
30 explicit affected versions
91 explicit affected versions
51 explicit affected versions
35 explicit affected versions
50 explicit affected versions
7 explicit affected versions
25 explicit affected versions
26 explicit affected versions
22 explicit affected versions
75 explicit affected versions
50 explicit affected versions
5 explicit affected versions
21 explicit affected versions
7 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2019-11191
- 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
- https://www.openwall.com/lists/oss-security/2019/04/03/4
- https://www.openwall.com/lists/oss-security/2019/04/03/4/1