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Files from Mateusz Guzik

First Active2012-11-23
Last Active2019-07-25
FreeBSD Security Advisory - FreeBSD-SA-19:15.mqueuefs
Posted Jul 25, 2019
Authored by Mateusz Guzik | Site security.freebsd.org

FreeBSD Security Advisory - System calls operating on file descriptors obtain a reference to relevant struct file which due to a programming error was not always put back, which in turn could be used to overflow the counter of affected struct file. A local user can use this flaw to obtain access to files, directories, sockets etc. opened by processes owned by other users. If obtained struct file represents a directory from outside of user's jail, it can be used to access files outside of the jail. If the user in question is a jailed root they can obtain root privileges on the host system.

tags | advisory, overflow, local, root
systems | freebsd, bsd
advisories | CVE-2019-5603
MD5 | 17ac53321b9a37616cc3344652d76b23
FreeBSD Security Advisory - FreeBSD-SA-16:03.linux
Posted Jan 15, 2016
Authored by Mateusz Guzik

FreeBSD Security Advisory - A programming error in the handling of Linux futex robust lists may result in incorrect memory locations being accessed. It is possible for a local attacker to read portions of kernel memory, which may result in a privilege escalation.

tags | advisory, kernel, local
systems | linux, freebsd
advisories | CVE-2016-1880
MD5 | 19a4fbae13440bc000d627d27942b0ed
FreeBSD Security Advisory - namei Memory Leak
Posted Oct 22, 2014
Authored by Mateusz Guzik | Site security.freebsd.org

FreeBSD Security Advisory - The namei facility will leak a small amount of kernel memory every time a sandboxed process looks up a nonexistent path name. A remote attacker that can cause a sandboxed process (for instance, a web server) to look up a large number of nonexistent path names can cause memory exhaustion.

tags | advisory, remote, web, kernel
systems | freebsd
advisories | CVE-2014-3711
MD5 | 844b73ebc895a6302bd825e68621cbf4
FreeBSD Security Advisory - Linux Input Validation
Posted Nov 23, 2012
Authored by Mateusz Guzik | Site security.freebsd.org

FreeBSD Security Advisory - FreeBSD is binary-compatible with the Linux operating system through a loadable kernel module/optional kernel component. A programming error in the handling of some Linux system calls may result in memory locations being accessed without proper validation. It is possible for a local attacker to overwrite portions of kernel memory, which may result in a privilege escalation or cause a system panic.

tags | advisory, kernel, local
systems | linux, freebsd
advisories | CVE-2012-4576
MD5 | 621bb2bf1b4bbcbdf821555933edf169
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