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Security issue in hammerhead
From: Jamie Strandboge <jamie () canonical com>
Date: Fri, 26 Aug 2011 15:14:33 -0500

A security bug was reported against hammerhead in Ubuntu. You are being
emailed as the upstream contact. Please keep
oss-security () lists openwall com[1] CC'd for any updates on this issue.

This issue should be considered public and has not yet been assigned a CVE.

Details from the public bug follow:

From the reporter:

"hammerhead blindly writes to to /tmp/hammer.log without prior checks.
It is possible to put a symbolic link at /tmp/hammer.log pointing at
another file - that hammerhead will then end up appending data into.
(it appears that hammerhead uses the file location as specified
in /etc/hammerhead/hh.conf - which in debian/ubuntu
is /tmp/hammer.log)."

A quick check shows that HH_LOG and REPORT_LOG are indeed being
unconditionally opened with 'fopen(..., "a+")' in src/hammerhead.cc. 

Thanks in advance for your cooperation in coordinating a fix for this

Jamie Strandboge

[1] oss-security () lists openwall com is a public mailing list for
    people to collaborate on security vulnerabilities and coordinate
    security updates.

PS - I couldn't find a security contact for hammerhead, so emailed to
those I could find in AUTHORS.

Jamie Strandboge             | http://www.canonical.com

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