CVE-2016-3134: Buffer Overflow

First published: Mon Mar 14 2016(Updated: )

In the mark_source_chains function (net/ipv4/netfilter/ip_tables.c) it is possible for a user-supplied ipt_entry structure to have a large next_offset field. This field is not bounds checked prior to writing a counter value at the supplied offset. Proposed fix: patch v1 message: <a href="http://marc.info/?l=netfilter-devel&amp;m=145757134822741&amp;w=2">http://marc.info/?l=netfilter-devel&amp;m=145757134822741&amp;w=2</a> patch v2 thread: <a href="http://marc.info/?t=145757149500006&amp;r=1&amp;w=2">http://marc.info/?t=145757149500006&amp;r=1&amp;w=2</a> patch v2 message: <a href="http://marc.info/?l=netfilter-devel&amp;m=145762719008418&amp;w=2">http://marc.info/?l=netfilter-devel&amp;m=145762719008418&amp;w=2</a> patch v2 thread: (none yet) <a href="http://marc.info/?l=netfilter-devel&amp;r=4&amp;b=201603&amp;w=2">http://marc.info/?l=netfilter-devel&amp;r=4&amp;b=201603&amp;w=2</a> CVE request and assignment: <a href="http://seclists.org/oss-sec/2016/q1/581">http://seclists.org/oss-sec/2016/q1/581</a> <a href="http://seclists.org/oss-sec/2016/q1/619">http://seclists.org/oss-sec/2016/q1/619</a> Audit done by netfilter team found several related bugs, patches to better validate rulesets are currently queued in pablos nf-next tree upstream (use "parent" link to cycle to next one - there are 17 additional patches): <a href="https://git.kernel.org/cgit/linux/kernel/git/pablo/nf-next.git/commit/?id=d7591f0c41ce3e67600a982bab6989ef0f07b3ce">https://git.kernel.org/cgit/linux/kernel/git/pablo/nf-next.git/commit/?id=d7591f0c41ce3e67600a982bab6989ef0f07b3ce</a>

Credit: meissner@suse.de security@opentext.com meissner@suse.de

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