USN-2513-1: Linux kernel vulnerabilities
First published: Thu Feb 26 2015(Updated: )
A flaw was discovered in the Kernel Virtual Machine's (KVM) emulation of the SYSTENTER instruction when the guest OS does not initialize the SYSENTER MSRs. A guest OS user could exploit this flaw to cause a denial of service of the guest OS (crash) or potentially gain privileges on the guest OS. (CVE-2015-0239) A flaw was discovered in the automatic loading of modules in the crypto subsystem of the Linux kernel. A local user could exploit this flaw to load installed kernel modules, increasing the attack surface and potentially using this to gain administrative privileges. (CVE-2013-7421) Andy Lutomirski discovered a flaw in how the Linux kernel handles pivot_root when used with a chroot directory. A local user could exploit this flaw to cause a denial of service (mount-tree loop). (CVE-2014-7970) A restriction bypass was discovered in iptables when conntrack rules are specified and the conntrack protocol handler module is not loaded into the Linux kernel. This flaw can cause the firewall rules on the system to be bypassed when conntrack rules are used. (CVE-2014-8160) A race condition was discovered in the Linux kernel's key ring. A local user could cause a denial of service (memory corruption or panic) or possibly have unspecified impact via the keyctl commands. (CVE-2014-9529) A memory leak was discovered in the ISO 9660 CDROM file system when parsing rock ridge ER records. A local user could exploit this flaw to obtain sensitive information from kernel memory via a crafted iso9660 image. (CVE-2014-9584) A flaw was discovered in the Address Space Layout Randomization (ASLR) of the Virtual Dynamically linked Shared Objects (vDSO) location. This flaw makes it easier for a local user to bypass the ASLR protection mechanism. (CVE-2014-9585) A flaw was discovered in the crypto subsystem when screening module names for automatic module loading if the name contained a valid crypto module name, eg. vfat(aes). A local user could exploit this flaw to load installed kernel modules, increasing the attack surface and potentially using this to gain administrative privileges. (CVE-2014-9644)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/linux-image-3.2.0-77-omap | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 | |
| All of | ||
| ubuntu/linux-image-3.2.0-77-generic | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 | |
| All of | ||
| ubuntu/linux-image-3.2.0-77-powerpc64-smp | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 | |
| All of | ||
| ubuntu/linux-image-3.2.0-77-highbank | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 | |
| All of | ||
| ubuntu/linux-image-3.2.0-77-powerpc-smp | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 | |
| All of | ||
| ubuntu/linux-image-3.2.0-77-virtual | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 | |
| All of | ||
| ubuntu/linux-image-3.2.0-77-generic-pae | <3.2.0-77.112 | 3.2.0-77.112 |
| Ubuntu Libksba8 | =12.04 |
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Reference Links
- https://ubuntu.com/security/CVE-2013-7421
- https://ubuntu.com/security/CVE-2014-7970
- https://ubuntu.com/security/CVE-2014-8160
- https://ubuntu.com/security/CVE-2014-9529
- https://ubuntu.com/security/CVE-2014-9584
- https://ubuntu.com/security/CVE-2014-9585
- https://ubuntu.com/security/CVE-2014-9644
- https://ubuntu.com/security/CVE-2015-0239
- https://ubuntu.com/security/notices/USN-2543-1
- https://ubuntu.com/security/notices/USN-2545-1
- https://ubuntu.com/security/notices/USN-2514-1
- https://ubuntu.com/security/notices/USN-2546-1
- https://ubuntu.com/security/notices/USN-2544-1
- https://ubuntu.com/security/notices/USN-2419-1
- https://ubuntu.com/security/notices/USN-2447-1
- https://ubuntu.com/security/notices/USN-2448-1
- https://ubuntu.com/security/notices/USN-2420-1
- https://ubuntu.com/security/notices/USN-2515-1
- https://ubuntu.com/security/notices/USN-2516-1
- https://ubuntu.com/security/notices/USN-2517-1
- https://ubuntu.com/security/notices/USN-2518-1
- https://ubuntu.com/security/notices/USN-2511-1
- https://ubuntu.com/security/notices/USN-2512-1
- https://launchpad.net/ubuntu/+source/linux/3.2.0-77.112
- https://ubuntu.com/security/notices/USN-2513-1 (Advisory)
Child vulnerabilities
(Contains the following vulnerabilities)
Frequently Asked Questions
What is the severity of USN-2513-1?
The severity of USN-2513-1 is considered to be high due to the potential for denial of service or privilege escalation.
How do I fix USN-2513-1?
To fix USN-2513-1, you should upgrade to the linux-image version 3.2.0-77.112 or later.
What is the impact of USN-2513-1?
The impact of USN-2513-1 includes possible crashes of the guest OS and a potential increase in privileges for an attacker.
Which versions of Ubuntu are affected by USN-2513-1?
USN-2513-1 affects Ubuntu 12.04 with specific kernel image packages listed in the advisory.
Is there an explanation for the vulnerability in USN-2513-1?
The vulnerability in USN-2513-1 stems from a flaw in the Kernel Virtual Machine's emulation of the SYSTENTER instruction when not properly initialized by the guest OS.
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