manipulating stack frames and, run arbitrary code with kernel
privileges.
The vulnerability can be used to gain kernel / supervisor privilege.
This can for example be used by normal users to gain root privileges,
to break out of jails, or bypass Mandatory Access Control (MAC)
restrictions.
IV. Workaround
No workaround is available, but only systems running the 64 bit
systems and distributed environments currently suffer from poor
security support and cannot resist common attacks (spamming, worms,
session hijacking, buffer overflow, denial of service, social
engineering, etc.). Collaborative organizations require better
security properties (strong authentication, efficient encryption,
Mandatory Access Control, integrity, non-repudiation and
availability). Nowadays, collaborative organizations use new
technologies such as mobile devices, smartcards, wireless networks,
high performance networks, grid computing, multi-agent systems,
peer-to-peer systems, sensor networks. These environments introduce
new needs, requirements and difficulties related to security. Hence,
Mitigation
-----------------------
Recent kernels with mmap_min_addr support may prevent exploitation if
the sysctl vm.mmap_min_addr is set above zero. However, administrators
should be aware that LSM based mandatory access control systems, such
as SELinux, may alter this functionality.
It should also be noted that all kernels up to 2.6.30.2 are vulnerable to
published attacks against mmap_min_addr.
