Openbsd : Security Vulnerabilities, CVEs,

ip_input.c in BSD-derived TCP/IP implementations allows remote attackers to cause a denial of service (crash or hang) via crafted packets.

IP fragmentation denial of service in FreeBSD allows a remote attacker to cause a crash.

File creation and deletion, and remote execution, in the BSD line printer daemon (lpd).

The chpass command in OpenBSD allows a local user to gain root access through file descriptor leakage.

Buffer overflow in BNU UUCP daemon (uucpd) through long hostnames.

mmap function in BSD allows local attackers in the kmem group to modify memory through devices.

The system configuration control (sysctl) facility in BSD based operating systems OpenBSD 2.2 and earlier, and FreeBSD 2.2.5 and earlier, does not properly restrict source routed packets even when the (1) dosourceroute or (2) forwarding variables are set, which allows remote attackers to spoof TCP connections.

FreeBSD mmap function allows users to modify append-only or immutable files.

A race condition between the select() and accept() calls in NetBSD TCP servers allows remote attackers to cause a denial of service.

Denial of service in "poll" in OpenBSD.

OpenBSD kernel crash through TSS handling, as caused by the crashme program.

OpenBSD crash using nlink value in FFS and EXT2FS filesystems.

Buffer overflow in OpenBSD ping.

Remote attackers can cause a system crash through ipintr() in ipq in OpenBSD.

The BSD profil system call allows a local user to modify the internal data space of a program via profiling and execve.

OpenBSD, BSDI, and other Unix operating systems allow users to set chflags and fchflags on character and block devices.

Buffer overflow in OpenBSD procfs and fdescfs file systems via uio_offset in the readdir() function.

A kernel leak in the OpenBSD kernel allows IPsec packets to be sent unencrypted.

Buffer overflow in bootpd on OpenBSD, FreeBSD, and Linux systems via a malformed header type.

An SSH 1.2.27 server allows a client to use the "none" cipher, even if it is not allowed by the server policy.

The asynchronous I/O facility in 4.4 BSD kernel does not check user credentials when setting the recipient of I/O notification, which allows local users to cause a denial of service by using certain ioctl and fcntl calls to cause the signal to be sent to an arbitrary process ID.

rpc.mountd on Linux, Ultrix, and possibly other operating systems, allows remote attackers to determine the existence of a file on the server by attempting to mount that file, which generates different error messages depending on whether the file exists or not.

The BSD make program allows local users to modify files via a symlink attack when the -j option is being used.

The SSH protocol server sshd allows local users without shell access to redirect a TCP connection through a service that uses the standard system password database for authentication, such as POP or FTP.

The default configuration of SSH allows X forwarding, which could allow a remote attacker to control a client's X sessions via a malicious xauth program.