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.
- Run
bin/test-glibc.shto check if your system is vulnerable - Update the glibc packages
- Reboot the system or restart all affected services
- Run
bin/test-glibc.shagain 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
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