Linux Kernel install_exec_creds() Address Space Layout Randomization Bypass Vulnerability [CVE-2019-11190]
CVE Number – CVE-2019-11190
A vulnerability in the Linux Kernel could allow a local attacker to access sensitive information on a targeted system.The vulnerability is due to a race condition in the ptrace_may_access() function of the affected software. An attacker could exploit this vulnerability by accessing the system and calling the install_exec_creds() function on the targeted system. A successful exploit could allow the attacker to bypass Address Space Layout Randomization (ASLR) on setuid programs, which could allow the attacker to access sensitive information on a targeted system.Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.Kernel.org has confirmed the vulnerability and released a software update.
Analysis
- To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement may reduce the likelihood of a successful exploit.
Safeguards
- Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to access local systems.Administrators are advised to allow only privileged users to access administration or management systems.Administrators are advised to monitor critical systems.
Vendor Announcements
- Kernel.org has released git commits at the following links: commit a5b5352558f6808db0589644ea5401b3e3148a0d and commit e1676b55d874a43646e8b2c46d87f2f3e45516ff
Fixed Software
- Kernel.org has released software patches at the following link: 3.18-stable patches and 4.4-stable patches
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.