CVE-2015-7547

glibc vulnerability test script

This provides a shell script for testing the glibc vulnerability CVE-2015-7547. It's written for rpm based systems such as Red Hat Enterprise Linux / RHEL / CentOS (5/6/7). Detection for other distributions may follow.

Resolution

1. Run bin/test-glibc.sh to check if your system is vulnerable
2. Update the glibc packages
3. Reboot the system or restart all affected services
4. Run bin/test-glibc.sh again to verify

In case you are unable to restart the entire system after applying the update, execute the following command to list all running processes (not restricted to services) still using the old [in-memory] version of glibc on your system.

lsof +c0 -d DEL | awk 'NR==1 || /libc-/ {print $2,$1,$4,$NF}' | column -t

Further information

Google Security Blog:

https://googleonlinesecurity.blogspot.be/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html

Glibc Bug Report:

https://sourceware.org/bugzilla/show_bug.cgi?id=18665

Red Hat / CentOS:

https://access.redhat.com/articles/2161461

https://access.redhat.com/security/cve/CVE-2015-7547

Debian Squeeze, Wheezy, Jessy & Stretch:

https://security-tracker.debian.org/tracker/CVE-2015-7547

Ubuntu 12.04 & 14.04:

http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-7547.html

On Ubuntu 14.04 LTS make sure you get the following output

ldd --version | head -1
ldd (Ubuntu EGLIBC 2.19-0ubuntu6.7) 2.19