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CVE-2013-5666

Status Candidate

Overview

The sendfile system-call implementation in sys/kern/uipc_syscalls.c in the kernel in FreeBSD 9.2-RC1 and 9.2-RC2 does not properly pad transmissions, which allows local users to obtain sensitive information (kernel memory) via a length greater than the length of the file.

Related Files

FreeBSD Security Advisory - sendfile(2) Kernel Memory Disclosure
Posted Sep 10, 2013
Authored by Ed Maste | Site security.freebsd.org

FreeBSD Security Advisory - The sendfile(2) system call allows a server application (such as an HTTP or FTP server) to transmit the contents of a file over a network connection without first copying it to application memory. High performance servers such as Apache and ftpd use sendfile. On affected systems, if the length passed to sendfile(2) is non-zero and greater than the length of the file being transmitted, sendfile(2) will pad the transmission up to the requested length or the next pagesize boundary, whichever is smaller. The content of the additional bytes transmitted in this manner depends on the underlying filesystem, but may potentially include information useful to an attacker. An unprivileged user with the ability to run arbitrary code may be able to obtain arbitrary kernel memory contents.

tags | advisory, web, arbitrary, kernel
systems | freebsd
advisories | CVE-2013-5666
MD5 | 5b77f46ddda4cdbf66adc9fbaf7f4e9d
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