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kfreebsd-9: privilege escalation/information leak

Package(s):kfreebsd-9 CVE #(s):CVE-2013-3077 CVE-2013-4851 CVE-2013-5209
Created:August 27, 2013 Updated:August 28, 2013
Description: From the Debian advisory:

CVE-2013-3077: Clement Lecigne from the Google Security Team reported an integer overflow in computing the size of a temporary buffer in the IP multicast code, which can result in a buffer which is too small for the requested operation. An unprivileged process can read or write pages of memory which belong to the kernel. These may lead to exposure of sensitive information or allow privilege escalation.

CVE-2013-4851: Rick Macklem, Christopher Key and Tim Zingelman reported that the FreeBSD kernel incorrectly uses client supplied credentials instead of the one configured in exports(5) when filling out the anonymous credential for a NFS export, when -network or -host restrictions are used at the same time. The remote client may supply privileged credentials (e.g. the root user) when accessing a file under the NFS share, which will bypass the normal access checks.

CVE-2013-5209: Julian Seward and Michael Tuexen reported a kernel memory disclosure when initializing the SCTP state cookie being sent in INIT-ACK chunks, a buffer allocated from the kernel stack is not completely initialized. Fragments of kernel memory may be included in SCTP packets and transmitted over the network. For each SCTP session, there are two separate instances in which a 4-byte fragment may be transmitted.

This memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way. For example, a terminal buffer might include an user-entered password.

Alerts:
Debian DSA-2743-1 2013-08-27

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