Title: FreeBSD IEEE 802.11 Network Subsystem Remote Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
FreeBSD contains an 802.11 network subsystem that implements protocol negotiations to support wireless networking.
FreeBSD is susceptible to a remote, kernel-level buffer overflow vulnerability. This issue is due to a failure of the kernel to properly bounds check user-supplied network data.
This issue is due to an integer overflow in the handling of corrupt 802.11 beacon or probe response frames. This occurs when scanning for existing wireless networks. The integer overflow results in a 'memcpy()' operation copying attacker-supplied data past the end of an insufficiently sized kernel memory buffer.
This issue allows remote attackers to execute arbitrary machine code in the context of the affected kernel, facilitating the complete compromise of affected computers. As this issue is present in a low-level network subsystem, it is likely exploitable even if the host is blocking packets with a host-based packet filter.
Affected Products:
- FreeBSD FreeBSD 6.0.0 -RELEASE
- FreeBSD FreeBSD 6.0.0 -STABLE
References:
- FreeBSD: FreeBSD Homepage
- FreeBSD: FreeBSD Security Information
- Karl Janmar: signedness.org public security advisory 0x1
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