Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). De4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker could use this to expose sensitive information (kernel memory) or possibly execute arbitrary code. Various other vulnerabilities were also addressed.
4c43b77dc14ec38d515895508c90603e29e4435a67390143e2cb91e68bc70e9dUbuntu Security Notice 5295-1 - It was discovered that the Packet network protocol implementation in the Linux kernel contained a double-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Jann Horn discovered a race condition in the Unix domain socket implementation in the Linux kernel that could result in a read-after-free. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.
b547d8a973a224e901b06eaeedecd20d12b7bfbede9c1be88b6689532cb1a805Ubuntu Security Notice 5130-1 - Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the TIOCSPGRP ioctl, leading to a use-after- free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information. Various other issues were also addressed.
b17505018c4425c9656c7d3f88f088126561b05c8d0305c63f206297d8335a5eUbuntu Security Notice 4678-1 - It was discovered that the AMD Running Average Power Limit driver in the Linux kernel did not properly restrict access to power data. A local attacker could possibly use this to expose sensitive information. Jann Horn discovered that the io_uring subsystem in the Linux kernel did not properly perform reference counting in some situations. A local attacker could use this to expose sensitive information or possibly escalate privileges. Various other issues were also addressed.
76fb1e8b149a4027ee272b7b82dc8e68b76dba0c040151881c7eb20f5d207ee8Ubuntu Security Notice 4208-1 - Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux kernel did not properly handle reference counting during memory mapping operations when used in conjunction with AUFS. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel did not properly validate SSID lengths. A physically proximate attacker could use this to cause a denial of service. Various other issues were also addressed.
d5691922a16d58d9a5c36957095d3c4c634522efb2e8beeeed67bae03127dd0bUbuntu Security Notice 4209-1 - Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux kernel did not properly handle reference counting during memory mapping operations when used in conjunction with AUFS. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a buffer overflow existed in the 802.11 Wi-Fi configuration interface for the Linux kernel when handling beacon settings. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
af74f433c67ce8c32217ce7ddea1e0aa863ae55b69e9c244cdbbc428d4d92911Ubuntu Security Notice 4069-1 - It was discovered that an integer overflow existed in the Linux kernel when reference counting pages, leading to potential use-after-free issues. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Jann Horn discovered that a race condition existed in the Linux kernel when performing core dumps. A local attacker could use this to cause a denial of service or expose sensitive information. Various other issues were also addressed.
59868a26f79be380a03153a4ef3d8b3c9a12618231d06c2df1d94cb0bd3be8f3Debian Linux Security Advisory 4484-1 - Jann Horn discovered that the ptrace subsystem in the Linux kernel mishandles the management of the credentials of a process that wants to create a ptrace relationship, allowing a local user to obtain root privileges under certain scenarios.
f9eb27ffe2fd4a5b01dda4f4541e92421403c124e205baa16698ce8353887e1eUbuntu Security Notice 4001-2 - USN-4001-1 fixed a vulnerability in libseccomp. This update provides the corresponding update for Ubuntu 14.04 ESM. Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall argument comparisons with arithmetic operators. An attacker could use this to bypass intended access restrictions for argument-filtered system calls. Various other issues were also addressed.
3783ae85bece13ddc1bd387465ffc67476ccb3ef43cf43c7d11db72875308e08Ubuntu Security Notice 4001-1 - Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall argument comparisons with arithmetic operators. An attacker could use this to bypass intended access restrictions for argument-filtered system calls.
23b5565883c626d654d99f5b47bd16b675b6316293fe57bab66ec2f2bf383ccfDebian Linux Security Advisory 4428-1 - Jann Horn discovered that the PAM module in systemd insecurely uses the environment and lacks seat verification permitting spoofing an active session to PolicyKit. A remote attacker with SSH access can take advantage of this issue to gain PolicyKit privileges that are normally only granted to clients in an active session on the local console.
47de208882b207bd2b8fbff35aeb3e74f10cdff098ac4297f3f5d6f9b2cd6d55Ubuntu Security Notice 3938-1 - Jann Horn discovered that pam_systemd created logind sessions using some parameters from the environment. A local attacker could exploit this in order to spoof the active session and gain additional PolicyKit privileges.
04cac38809c24fd6bf8181037a959b4415679aa832a9f2d739d10fbaf31ce2c4Ubuntu Security Notice 3917-1 - The snapd default seccomp filter for strict mode snaps blocks the use of the ioctl system call when used with TIOCSTI as the second argument to the system call. Jann Horn discovered that this restriction could be circumvented on 64 bit architectures. A malicious snap could exploit this to bypass intended access restrictions to insert characters into the terminal's input queue. On Ubuntu, snapd typically will have already automatically refreshed itself to snapd 2.37.4 which is unaffected.
13a2bdb1b443d25b262c5bc7b4b990dd9fd330319e9950c08bf7851a447bfb28Ubuntu Security Notice 3908-2 - USN-3908-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 ESM. Jann Horn discovered a race condition in the fork system call in the Linux kernel. A local attacker could use this to gain access to services that cache authorizations. Various other issues were also addressed.
cd355e52a9ac1d0dd8d224b975200733feb1d18ffeb317d9897cb4ec40c38fc4Ubuntu Security Notice 3908-1 - Jann Horn discovered a race condition in the fork system call in the Linux kernel. A local attacker could use this to gain access to services that cache authorizations.
023d1e358ad840166c4cd8f953f17797e904596a1e9445469abd9820bf705639Ubuntu Security Notice 3903-1 - Jason Wang discovered that the vhost net driver in the Linux kernel contained an out of bounds write vulnerability. An attacker in a guest virtual machine could use this to cause a denial of service or possibly execute arbitrary code in the host kernel. Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. Various other issues were also addressed.
73c11215ef38f1741368473e63e13f27c7a6aeadf7ef9a8536e6a489ec56ddf7Ubuntu Security Notice 3901-2 - USN-3901-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS. Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. Various other issues were also addressed.
c25a324edcfdb0698186cf0255921ec343ba3bedda004de93b2622c9d0166073Ubuntu Security Notice 3901-1 - Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. It was discovered that the crypto subsystem of the Linux kernel leaked uninitialized memory to user space in some situations. A local attacker could use this to expose sensitive information. Various other issues were also addressed.
2733d1718525888590b59662b23b1cc1de9b8d11aba8290d25b543ffd636e966Ubuntu Security Notice 3880-1 - It was discovered that the CIFS client implementation in the Linux kernel did not properly handle setup negotiation during session recovery, leading to a NULL pointer exception. An attacker could use this to create a malicious CIFS server that caused a denial of service. Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. Various other issues were also addressed.
eb0ada9fcea297efc352c24bdd5ddeae3d18ba54e2e99898677029db73d54cb5Ubuntu Security Notice 3842-1 - Jann Horn discovered that CUPS incorrectly handled session cookie randomness. A remote attacker could possibly use this issue to perform cross-site request forgery attacks.
830d27a53042e4171fdb06fa615f97b6d6d61e7a9870086efbf089779ff5fda9Ubuntu Security Notice 3836-2 - USN-3836-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS. Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. Various other issues were also addressed.
a16f0a83e02d3a223fa194bb6e8753f511a0439bdb62c486b7cff7d861d45961Ubuntu Security Notice 3836-1 - Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. Philipp Wendler discovered that the overlayfs implementation in the Linux kernel did not properly verify the directory contents permissions from within a unprivileged user namespace. A local attacker could use this to expose sensitive information. Various other issues were also addressed.
381aa075aa2708693455c43a91237a24db2a3c496d9a9b5a2b1927429cfebeb4Ubuntu Security Notice 3835-1 - Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. Jann Horn discovered that the mremap system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service , expose sensitive information, or possibly execute arbitrary code. Various other issues were also addressed.
0d98e117a7daeada246e248b8dd8991176e44f3691e448cdd5919caf358556aaUbuntu Security Notice 3833-1 - Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. Philipp Wendler discovered that the overlayfs implementation in the Linux kernel did not properly verify the directory contents permissions from within a unprivileged user namespace. A local attacker could use this to expose sensitive information. Various other issues were also addressed.
a245ddd2e063e75ae9b8cd656c2ba843ed10ef466025e17abe119b7bfbe3080aUbuntu Security Notice 3832-1 - Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. Jann Horn discovered that the mremap system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service , expose sensitive information, or possibly execute arbitrary code. Various other issues were also addressed.
b57e39d7a6b2621e28ea09c25523ef6ffe045219afabe19ad27f96586c416cd1Ubuntu Security Notice 3816-2 - USN-3816-1 fixed several vulnerabilities in systemd. However, the fix for CVE-2018-6954 was not sufficient. This update provides the remaining fixes. Jann Horn discovered that unit_deserialize incorrectly handled status messages above a certain length. A local attacker could potentially exploit this via NotifyAccess to inject arbitrary state across re-execution and obtain root privileges. Jann Horn discovered a race condition in chown_one. A local attacker could potentially exploit this by setting arbitrary permissions on certain files to obtain root privileges. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. It was discovered that systemd-tmpfiles mishandled symlinks in non-terminal path components. A local attacker could potentially exploit this by gaining ownership of certain files to obtain root privileges. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Various other issues were also addressed.
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