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Ubuntu 11.04 USN-1211-1 Critical: Multiple Kernel Flaws Resolved

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Calendar Grey September 21, 2011
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Multiple kernel flaws fixed in Ubuntu USN-1211-1 advisory, enhancing system security against critical threats.
Multiple kernel flaws have been fixed.

Summary

Multiple kernel flaws have been fixed.

Software Description:

- linux: Linux kernel

Details:

It was discovered that the /proc filesystem did not correctly handle

permission changes when programs executed. A local attacker could hold open

files to examine details about programs running with higher privileges,

potentially increasing the chances of exploiting additional

vulnerabilities. (CVE-2011-1020)

Dan Rosenberg discovered that the X.25 Rose network stack did not correctly

handle certain fields. If a system was running with Rose enabled, a remote

attacker could send specially crafted traffic to gain root privileges.

(CVE-2011-1493)

Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not

correctly check the origin of mount points. A local attacker could exploit

this to trick the system into unmounting arbitrary mount points, leading to

a denial of service. (CVE-2011-1833)

It was discovered that Bluetooth l2cap and rfcomm did not correctly

in...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical software update kernel flaw ubuntu system crash

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 11.04:
  linux-image-2.6.38-11-generic   2.6.38-11.50
  linux-image-2.6.38-11-generic-pae  2.6.38-11.50
  linux-image-2.6.38-11-omap      2.6.38-11.50
  linux-image-2.6.38-11-powerpc   2.6.38-11.50
  linux-image-2.6.38-11-powerpc-smp  2.6.38-11.50
  linux-image-2.6.38-11-powerpc64-smp  2.6.38-11.50
  linux-image-2.6.38-11-server    2.6.38-11.50
  linux-image-2.6.38-11-versatile  2.6.38-11.50
  linux-image-2.6.38-11-virtual   2.6.38-11.50

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-1211-1

CVE-2011-1020, CVE-2011-1493, CVE-2011-1833, CVE-2011-2492,

CVE-2011-2689, CVE-2011-2699, CVE-2011-2918

Severity
critical
Lowest
Low
Medium
High
Critical

September 21, 2011

Topics%20covered

Topics Covered

security advisory denial of service critical software update kernel flaw ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/2.6.38-11.50

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