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Packet Storm Advisory 2014-1204-1 - Offset2lib: Bypassing Full ASLR On 64bit Linux

Packet Storm Advisory 2014-1204-1 - Offset2lib: Bypassing Full ASLR On 64bit Linux
Posted Dec 5, 2014
Authored by Hector Marco, Ismael Ripoll | Site packetstormsecurity.com

The release of this advisory provides exploitation details in relation a weakness in the Linux ASLR implementation. The problem appears when the executable is PIE compiled and it has an address leak belonging to the executable. These details were obtained through the Packet Storm Bug Bounty program and are being released to the community.

tags | advisory, bug bounty, packet storm
systems | linux
SHA-256 | 57833cb6d2c4d2d145ba4e56f348f6182a247930713b65de664031a38287a959

Packet Storm Advisory 2014-1204-1 - Offset2lib: Bypassing Full ASLR On 64bit Linux

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

+------------------------------------------------------------------------------+
| Packet Storm Advisory 2014-1204-1 |
| http://packetstormsecurity.com/ |
+------------------------------------------------------------------------------+
| Title: Offset2lib: Bypassing Full ASLR On 64bit Linux |
+--------------------+---------------------------------------------------------+
| Release Date | 2014/12/04 |
| Advisory Contact | Packet Storm (advisories@packetstormsecurity.com) |
| Researchers | Hector Marco and Ismael Ripoll |
+--------------------+---------------------------------------------------------+
| System Affected | 64 bit PIE Linux |
| Classification | 1-day |
+--------------------+---------------------------------------------------------+

+----------+
| OVERVIEW |
+----------+

The release of this advisory provides exploitation details in relation
a weakness in the Linux ASLR implementation. The problem appears when
the executable is PIE compiled and it has an address leak belonging to
the executable.

These details were obtained through the Packet Storm Bug Bounty program
and are being released to the community.

+------------------------------------------------------------------------------+

+---------+
| DETAILS |
+---------+

An attacker is able to de-randomize all mmapped areas (libraries, mapped files, etc.)
by knowing only an address belonging to the application and the offset2lib value.

+------------------------------------------------------------------------------+

+------------------+
| PROOF OF CONCEPT |
+------------------+

The proof of concept exploit code is available here:
http://packetstormsecurity.com/files/129398

+------------------------------------------------------------------------------+

+---------------+
| RELATED LINKS |
+---------------+

http://cybersecurity.upv.es/attacks/offset2lib/offset2lib.html

+------------------------------------------------------------------------------+


+----------------+
| SHAMELESS PLUG |
+----------------+

The Packet Storm Bug Bounty program gives researchers the ability to profit
from their discoveries. You can get paid thousands of dollars for one day
and zero day exploits. Get involved by contacting us at
getpaid@packetstormsecurity.com or visit the bug bounty page at:

http://packetstormsecurity.com/bugbounty/

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