Linux Kernel - Multiple Vulnerabilities
Summary
DSA-2669-1: linux - several. Affects linux versions < 3.2.41-2+deb7u2. Fixed in 3.2.41-2+deb7u2. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system. It provides essential functionality and interfaces for various hardware devices, system processes, and user applications. The kernel is responsible for managing system resources, executing user programs, and ensuring security and stability. However, several vulnerabilities have been discovered in the Linux kernel that could potentially lead to denial of service, information leaks, or privilege escalation.
Vulnerability Detail
The Linux kernel is affected by multiple vulnerabilities, including:
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Timing leak in /dev/ptmx character device (CVE-2013-0160): A local user can exploit this vulnerability to determine sensitive information, such as password length.
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Memory corruption in the KVM subsystem (CVE-2013-1796): A user in a guest operating system can corrupt kernel memory, resulting in a denial of service.
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Overflow condition in Broadcom Tigon3 based gigabit Ethernet driver (CVE-2013-1929): Users with the ability to attach untrusted devices can trigger an overflow, leading to a denial of service or elevated privileges.
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Privilege escalation in socket level control message processing subsystem (CVE-2013-1979): Local users may be able to gain elevated privileges through this vulnerability.
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Denial of service in ext4 filesystem (CVE-2013-2015): Local users with the ability to mount a specially crafted filesystem can cause an infinite loop, resulting in a denial of service.
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Privilege escalation in the perf subsystem (CVE-2013-2094): An out-of-bounds access vulnerability allows local users to gain elevated privileges.
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Access to sensitive kernel memory in various protocol support (CVE-2013-3076, CVE-2013-3222, CVE-2013-3223, CVE-2013-3224, CVE-2013-3225, CVE-2013-3227, CVE-2013-3228, CVE-2013-3229, CVE-2013-3231, CVE-2013-3234, CVE-2013-3235): Local users can gain access to sensitive kernel memory through various protocol support.
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Denial of service in the tracing subsystem (CVE-2013-3301): A privileged local user can cause a system crash, resulting in a denial of service.
These vulnerabilities pose a significant risk to the security and stability of systems running the affected Linux kernel versions.
How To Fix
Minimum fixed version
3.2.41-2+deb7u2
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 →
Workaround
There are no specific workarounds mentioned for these vulnerabilities. However, users can mitigate the risk by following general security best practices, such as limiting access to trusted devices, applying strict permissions to sensitive files and directories, and regularly updating the system with security patches.
Conclusion
Multiple vulnerabilities have been discovered in the Linux kernel, which could lead to denial of service, information leaks, or privilege escalation. It is crucial to update the Linux kernel package to the recommended version or later to mitigate these vulnerabilities. Regularly updating the system and following security best practices are essential for maintaining the security and stability of Linux-based systems. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
These vulnerabilities can lead to denial of service, information leaks, and privilege escalation. Attackers with local access to the system may be able to gain elevated privileges or cause a system crash, resulting in a loss of availability and potential exposure of sensitive information.
The vulnerabilities listed in this advisory affect specific versions of the Linux kernel. It is recommended to check the advisory and ensure that the installed kernel version is included in the affected range.
Most of the vulnerabilities mentioned in this advisory require local access to the system. However, it is always recommended to keep the system up to date with the latest security patches to mitigate any potential remote exploitation vectors.
At the time of this advisory, there are no known public exploits for these vulnerabilities. However, it is important to apply the recommended security updates to protect against any potential future exploits.
For more information about these vulnerabilities, including detailed technical descriptions and references to the Common Vulnerabilities and Exposures (CVE) identifiers, you can refer to the Debian Security Tracker website or the provided CVE links in the advisory.
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