var-201009-0269
Vulnerability from variot

Multiple integer signedness errors in smb_subr.c in the netsmb module in the kernel in NetBSD 5.0.2 and earlier, FreeBSD, and Apple Mac OS X allow local users to cause a denial of service (panic) via a negative size value in a /dev/nsmb ioctl operation, as demonstrated by a (1) SMBIOC_LOOKUP or (2) SMBIOC_OPENSESSION ioctl call. Multiple BSD kernels are prone to multiple local denial-of-service vulnerabilities because they fail to properly verify signedness of user-supplied values. Attackers can exploit these issues to cause the kernel to panic, denying service to legitimate users. Given the nature of these issues, attackers may be able to execute arbitrary code, but this has not been confirmed. These issues affect versions prior to the 'netsmb' kernel module 1.35 on NetBSD, FreeBSD, and Apple OS X where 'netsmb' is available as a kernel extension. NetBSD/FreeBSD/Apple Mac OS X are all operating systems based on the BSD system. This vulnerability has been confirmed in the ioctl response of (1) SMBIOC_LOOKUP or (2) SMBIOC_OPENSESSION

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