Linux Kernel fs/ext4/extents.c Information Disclosure Vulnerability [CVE-2019-11833]
CVE Number – CVE-2019-11833
A vulnerability in the Linux Kernel could allow a local attacker to access sensitive information on a targeted system.
The vulnerability exists because the fs/ext4/extents.c source code file of the affected software does not zero out the unused memory region in the extent tree block. An attacker could exploit this vulnerability by accessing the system and executing an application that allows the attacker to read uninitialized data in the filesystem on the targeted system. A successful exploit could allow the attacker to access sensitive information, which could be used to conduct further attacks.
Kernel.org has confirmed the vulnerability and released software updates.
Analysis
- To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement could 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 a git commit at the following link: commit 592acbf16821288ecdc4192c47e3774a4c48bb64
Fixed Software
- Kernel.org has released software updates at the following link: ext4: zero out the unused memory region in the extent tree block
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.