A quoting issue was found in chkrootkit which would lead to a file in /tmp/ being executed, if /tmp/ was mounted without the noexec option. chkrootkit is typically run as the root user. A local attacker could use this flaw to escalate their privileges.

The problematic part was:

file_port=$file_port $i

Which is changed to file_port="$file_port $i" to fix the issue. From the Debian diff:

--- chkrootkit-0.49.orig/debian/patches/CVE-2014-0476.patch
+++ chkrootkit-0.49/debian/patches/CVE-2014-0476.patch
@@ -0,0 +1,13 @@
+Index: chkrootkit/chkrootkit
+===================================================================
+--- chkrootkit.orig/chkrootkit
++++ chkrootkit/chkrootkit
+@@ -117,7 +117,7 @@ slapper (){
+    fi
+    for i in ${SLAPPER_FILES}; do
+       if [ -f ${i} ]; then
+-       file_port=$file_port $i
++       file_port="$file_port $i"
+          STATUS=1
+       fi
+    done

Acknowledgements:

Red Hat would like to thank Thomas Stangner for reporting this issue.