USN-3323-1: GNU C Library vulnerability

Ubuntu Security Notice USN-3323-1

19th June, 2017

eglibc, glibc vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Gnu C library could be made to run programs as an administrator.

Software description

  • eglibc - GNU C Library
  • glibc - GNU C Library

Details

It was discovered that the GNU C library did not properly handle memory
when processing environment variables for setuid programs. A local attacker
could use this in combination with another vulnerability to gain
administrative privileges.

Update instructions

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

Ubuntu 17.04:
libc6 2.24-9ubuntu2.2
Ubuntu 16.10:
libc6 2.24-3ubuntu2.2
Ubuntu 16.04 LTS:
libc6 2.23-0ubuntu9
Ubuntu 14.04 LTS:
libc6 2.19-0ubuntu6.13

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2017-1000366