Linux Kernel - Privilege Escalation, Denial of Service, and Information Disclosure
Summary
DSA-3372-1: linux - security update. Affects linux versions < 3.2.68-1+deb7u5. Fixed in 3.2.68-1+deb7u5. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing system resources and providing essential services. It is widely used in various distributions, including Debian. The kernel interacts with hardware devices, manages processes, and ensures security and stability. However, several vulnerabilities have been discovered in the Linux kernel that could lead to privilege escalation, denial of service, and unauthorized information disclosure or modification.
Vulnerability Detail
One of the vulnerabilities, identified as CVE-2015-2925, allows a user confined to a chroot or mount namespace to access the entire filesystem if they have write permission on an ancestor of a bind-mounted subdirectory. This issue has been fixed for the jessie distribution but may affect wheezy. Another vulnerability, CVE-2015-5257, involves a USB device imitating a Whiteheat USB serial device and causing a denial of service by presenting a smaller number of endpoints. CVE-2015-5283 affects jessie and can lead to a denial of service if multiple SCTP sockets are created simultaneously without the sctp module being loaded. Lastly, CVE-2015-7613 involves uninitialized System V IPC objects, which can result in unauthorized information disclosure, modification, denial of service, and privilege escalation if a local user races against another user or service creating a new IPC object.
How To Fix
Minimum fixed version
3.2.68-1+deb7u5
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Conclusion
The Linux kernel is susceptible to several vulnerabilities that can lead to privilege escalation, denial of service, and unauthorized information disclosure or modification. To ensure the security of your system, it is crucial to upgrade the Linux packages to the fixed versions mentioned. For further assistance and support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerabilities can lead to privilege escalation, denial of service, and unauthorized information disclosure or modification. They may allow an attacker to gain elevated privileges, crash the system, or access sensitive information.
The impact may vary depending on the distribution and version. The wheezy distribution is less affected, and some vulnerabilities have already been fixed for jessie. However, it is recommended to upgrade the Linux packages to ensure security.
The vulnerabilities primarily require local access to the system. However, if an attacker gains local access, they can exploit the vulnerabilities to escalate privileges, disrupt services, or manipulate information.
No specific workarounds are mentioned in the vulnerability details. It is advised to apply the recommended package upgrades to mitigate the vulnerabilities.
You can find more information about these vulnerabilities, including their CVE identifiers, in the Debian Security Tracker. Additionally, you can use Vulert (https://vulert.com) to monitor and receive real-time alerts for open-source vulnerabilities in your software.
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