This Metasploit module exploits a race and use-after-free vulnerability in the FreeBSD kernel IPv6 socket handling. A missing synchronization lock in the IPV6_2292PKTOPTIONS option handling in setsockopt permits racing ip6_setpktopt access to a freed ip6_pktopts struct. This exploit overwrites the ip6po_pktinfo pointer of a ip6_pktopts struct in freed memory to achieve arbitrary kernel read/write.
00b0e1e6a5651af403765318e00556b0c8953f9ef2bbda38acb929b269045b6aSony PS4 versions prior to 7.02 and FreeBSD versions 9 and 12 ip6_setpktopt kernel local privilege escalation proof of concept exploit.
aa0c602e1d16bd1c07fd735367383c0e4038bf3d25ff79c8ec71ab25d9f2b9f2FreeBSD Security Advisory - The kernel can create a core dump file when a process crashes that contains process state, for debugging. Due to incorrect initialization of a stack data structure, up to 20 bytes of kernel data stored previously stored on the stack will be exposed to a crashing user process. Sensitive kernel data may be disclosed.
178d5992a84290ac4a8dc6947197a0096dd8c410a6b2c14c552637e40cf2ff97FreeBSD Security Advisory - A missing check means that an attacker can reinject an old packet and it will be accepted and processed by the IPsec endpoint. The impact depends on the higher-level protocols in use over IPsec. For example, an attacker who can capture and inject packets could cause an action that was intentionally performed once to be repeated.
e5c1b2cd25568643f6713e1fd53907b388b7c12585108e84595b0c0c2ac91c36FreeBSD Security Advisory - A programming error allows an attacker who can specify a URL with a username and/or password components to overflow libfetch(3) buffers. An attacker in control of the URL to be fetched (possibly via HTTP redirect) may cause a heap buffer overflow, resulting in program misbehavior or malicious code execution.
58eb688b18a5f5586d60c4a6d426da578c845550c391c45bbf4d3e093091639eLocal root exploit for the FreeBSD fd vulnerability as disclosed in FreeBSD-SA-19:02.fd.
05adfc97defa9b66032601dddbc7174d89d7c42893b3449bce122d3043b86df0Local root exploit for the FreeBSD mqueuefs vulnerability as disclosed in FreeBSD-SA-19:15.mqueuefs.
90adbf6571ee419b5720c2c77c09ae73c0b991d5356d6bf9cdef1949b5a67b6dIn the macOS kernel, the XNU function wait_for_namespace_event() in bsd/vfs/vfs_syscalls.c releases a file descriptor for use by userspace but may then subsequently destroy that file descriptor using fp_free(), which unconditionally frees the fileproc and fileglob. This opens up a race window during which the process could manipulate those objects while they're being freed. Exploitation requires root privileges.
6d4e9cc704a5f5bbb4de66537161f105b64b583414a93c0e902c25bb793772b5FreeBSD Security Advisory - From time to time Intel releases new CPU microcode to address functional issues and security vulnerabilities. Such a release is also known as a Micro Code Update (MCU), and is a component of a broader Intel Platform Update (IPU). FreeBSD distributes CPU microcode via the devcpu-data port and package.
23eef89d8eeb80cd7f3d30fda491fafe5e3fa0290ff6e657bb63731a35babb3cFreeBSD 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.
b8976c51a157ffad5c715c1c5e8e3c4be69500c550b1d9f9a9862cd2b065c512FreeBSD Security Advisory - A function extracting the length from type-length-value encoding is not properly validating the submitted length. A remote user could cause, for example, an out-of-bounds read, decoding of unrelated data, or trigger a crash of the software such as bsnmpd resulting in a denial of service.
f03bcb9feddf2d950ed61f77228c3a12e63a2a09995ac33ae2fea33ab21e623bFreeBSD Security Advisory - If a process attempts to transmit rights over a UNIX-domain socket and an error causes the attempt to fail, references acquired on the rights are not released and are leaked. This bug can be used to cause the reference counter to wrap around and free the corresponding file structure. A local user can exploit the bug to gain root privileges or escape from a jail.
ed0e020ba12b1dc01aa8d83590ac696a40d1fccad60067e1fb8300dfbb889466FreeBSD Security Advisory - The pci_xhci_device_doorbell() function does not validate the 'epid' and 'streamid' provided by the guest, leading to an out-of-bounds read. A misbehaving bhyve guest could crash the system or access memory that it should not be able to.
22ddae49f77be04a48b0ef2c715801539b562f34653337c23b52f4f5dfa1668bFreeBSD 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.
489c8ae54e5e9d5645a9286ff4c958fe29ebf8eb10cfad1509a4f8ce2b45cf9eFreeBSD Security Advisory - Due to insufficient initialization of memory copied to userland in the components listed above small amounts of kernel memory may be disclosed to userland processes. A user who can invoke 32-bit FreeBSD ioctls may be able to read the contents of small portions of kernel memory. Such 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 a user-entered password.
0e0df08026cdde81c94f8a176b172a71c19e15379445944e64ecdd04b7315690FreeBSD Security Advisory - The code which handles a close(2) of a descriptor created by posix_openpt(2) fails to undo the configuration which causes SIGIO to be raised. This bug can lead to a write-after-free of kernel memory. The bug permits malicious code to trigger a write-after-free, which may be used to gain root privileges or escape a jail.
c20e2ba9892c896b4cdba0602e7caccb54edd10e2ab74a179baf8dc75414522dFreeBSD Security Advisory - Insufficient validation of environment variables in the telnet client supplied in FreeBSD can lead to stack-based buffer overflows. A stack-based overflow is present in the handling of environment variables when connecting via the telnet client to remote telnet servers. This issue only affects the telnet client. Inbound telnet sessions to telnetd(8) are not affected by this issue. These buffer overflows may be triggered when connecting to a malicious server, or by an active attacker in the network path between the client and server. Specially crafted TELNET command sequences may cause the execution of arbitrary code with the privileges of the user invoking telnet(1).
a289c2b38135f9f6339c9294178d141344dcea0087e3ea2bfa204b3700f119d5FreeBSD Security Advisory - A bug causes up to three bytes of kernel stack memory to be written to disk as uninitialized directory entry padding. This data can be viewed by any user with read access to the directory. Additionally, a malicious user with write access to a directory can cause up to 254 bytes of kernel stack memory to be exposed. Some amount of the kernel stack is disclosed and written out to the filesystem.
e8b30a3f33319307ddd94571cda888074a86c142e47d6d2f8d215c8258b22fd2FreeBSD Security Advisory - With certain inputs, iconv may write beyond the end of the output buffer. Depending on the way in which iconv is used, an attacker may be able to create a denial of service, provoke incorrect program behavior, or induce a remote code execution. iconv is a libc library function and the nature of possible attacks will depend on the way in which iconv is used by applications or daemons.
e7a88e1043e6911b4f4a63c30931cf6dab2b72238f92b1325a7882b6e52ede1aFreeBSD Security Advisory - While processing acknowledgements, the RACK code uses several linked lists to maintain state entries. A malicious attacker can cause the lists to grow unbounded. This can cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service. An attacker with the ability to send specially crafted TCP traffic to a victim system can degrade network performance and/or consume excessive CPU by exploiting the inefficiency of traversing the potentially very large RACK linked lists with relatively small bandwidth cost.
85f2ffcf89eae31c9b0babd62b1d66ae80b60a35fc0e3d2f7a258259db7a0affNetflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels. The vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. The most serious, dubbed _"SACK Panic_," allows a remotely-triggered kernel panic on recent Linux kernels. There are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective.
2842c96d7b20ef5dfb0f2ea06c76a1334026b1cbd1953a2b31793af5c8fa3ba7This Metasploit module exploits a vulnerability in the FreeBSD run-time link-editor (rtld). The rtld unsetenv() function fails to remove LD_* environment variables if __findenv() fails. This can be abused to load arbitrary shared objects using LD_PRELOAD, resulting in privileged code execution.
b7d2e9a938e3bd3e306735ac30c5547fb5873fe1a798d291f7cd437bdee37ad0FreeBSD Security Advisory - On some Intel processors utilizing speculative execution a local process may be able to infer stale information from microarchitectural buffers to obtain a memory disclosure. An attacker may be able to read secret data from the kernel or from a process when executing untrusted code (for example, in a web browser).
bb1bbf79007ddaee55b83d92fa13bc8a77826384109b261502a3a270db6cf311FreeBSD Security Advisory - Multiple vulnerabilities exist in the hostapd(8) and wpa_supplicant(8) implementations.
d9b765e8617c1094fd1b44bc80bae21176c9518147b96b6da2dc72d5f4fecdd6This Metasploit module exploits a vulnerability in the FreeBSD kernel, when running on 64-bit Intel processors. By design, 64-bit processors following the X86-64 specification will trigger a general protection fault (GPF) when executing a SYSRET instruction with a non-canonical address in the RCX register. However, Intel processors check for a non-canonical address prior to dropping privileges, causing a GPF in privileged mode. As a result, the current userland RSP stack pointer is restored and executed, resulting in privileged code execution.
f1711c3320d7c4e9f80661d007057fb1b0b673f47fb51ec2968a821bc6aa8991
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