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Files from Benjamin M. Romer

Email addressbenjamin.romer at canonical.com
First Active2017-04-15
Last Active2018-09-11
Kernel Live Patch Security Notice LSN-0043-1
Posted Sep 11, 2018
Authored by Benjamin M. Romer

Piotr Gabriel Kosinski and Daniel Shapira discovered a stack-based buffer overflow in the CDROM driver implementation of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Jann Horn discovered that the ext4 filesystem implementation in the Linux kernel did not properly keep xattr information consistent in some situations. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues have also been addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux
advisories | CVE-2018-11412, CVE-2018-11506, CVE-2018-12233, CVE-2018-13405, CVE-2018-13406
MD5 | 15d9cf4ac6ec9024e548bcb059849043
Kernel Live Patch Security Notice LSN-0042-1
Posted Aug 14, 2018
Authored by Benjamin M. Romer

On August 14, fixes for CVE-2018-3620 and CVE-2018-3646 were released into the Ubuntu Xenial and Bionic kernels. These CVEs are security vulnerabilities caused by flaws in the design of speculative execution hardware in the computer's CPU. Researchers discovered that memory present in the L1 data cache of an Intel CPU core may be visible to other processes running on the same core.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-3620, CVE-2018-3646
MD5 | dfbdb00734352df26fe57ac4d26bfeac
Kernel Live Patch Security Notice LSN-0041-1
Posted Aug 10, 2018
Authored by Benjamin M. Romer

The sr_do_ioctl function in drivers/scsi/sr_ioctl.c in the Linux kernel through 4.16.12 allows local users to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impact because sense buffers have different sizes at the CDROM layer and the SCSI layer, as demonstrated by a CDROMREADMODE2 ioctl call. Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). Various other issues were also addressed.

tags | advisory, denial of service, overflow, kernel, local
systems | linux
advisories | CVE-2018-1094, CVE-2018-11506, CVE-2018-13094, CVE-2018-13405, CVE-2018-5390
MD5 | fc944208680854f3168be2702b530c3b
Kernel Live Patch Security Notice LSN-0040-1
Posted Jul 5, 2018
Authored by Benjamin M. Romer

Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly handle corrupted meta data in some situations. An attacker could use this to specially craft an ext4 file system that caused a denial of service (system crash) when mounted. It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2018-1092, CVE-2018-1093, CVE-2018-3665, CVE-2018-7755
MD5 | 12dc1b657d3a63120fd299195c1684b4
Kernel Live Patch Security Notice LSN-0039-1
Posted May 28, 2018
Authored by Benjamin M. Romer

Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF) implementation in the Linux kernel contained a branch-pruning logic issue around unreachable code. A local attacker could use this to cause a denial of service. The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted ext4 image. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, root
systems | linux
advisories | CVE-2017-17862, CVE-2018-1000004, CVE-2018-1092, CVE-2018-1093, CVE-2018-8087
MD5 | b00a0d7a8bfca8dc02b44351db6c3dcc
Kernel Live Patch Security Notice LSN-0038-1
Posted May 9, 2018
Authored by Benjamin M. Romer

On May 8, fixes for CVE-2018-1087 and CVE-2018-8897 were released in linux kernel version 4.4.0-124.148. These CVEs are both related to the way that the linux kernel handles certain interrupt and exception instructions. If an interrupt or exception instruction (INT3, SYSCALL, etc.) is immediately preceded by a MOV SS or POP SS instruction, the resulting interrupt will be incorrectly handled, possibly crashing the operating system. The issue can be triggered by an unprivileged user. The fix for this problem requires modification of the interrupt descriptor tables (IDT), and modification of the interrupt handlers. Livepatch is unable to safely modify these areas, so upgrading to a corrected kernel and rebooting is required to fix the problem.

tags | advisory, kernel
systems | linux
advisories | CVE-2018-1087, CVE-2018-8897
MD5 | 2fffde47d47abae2cb1a8834a15b901f
Kernel Live Patch Security Notice LSN-0037-1
Posted May 7, 2018
Authored by Benjamin M. Romer

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation in the Linux kernel improperly performed sign extension in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. It was discovered that a race condition leading to a use-after-free vulnerability existed in the ALSA PCM subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-0861, CVE-2017-15129, CVE-2017-16995, CVE-2017-17448, CVE-2017-17450, CVE-2018-1000199, CVE-2018-5333, CVE-2018-5344, CVE-2018-8043
MD5 | 70c039f34496a5cffda6c354f241701c
Kernel Live Patch Security Notice LSN-0036-1
Posted Apr 2, 2018
Authored by Benjamin M. Romer

Wi-Fi Protected Access (WPA and WPA2) allows re-installation of the Group Temporal Key (GTK) during the group key handshake, allowing an attacker within radio range to replay frames from access points to clients. Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation in the Linux kernel improperly performed sign extension in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-13080, CVE-2017-16995
MD5 | 5db75445369ea25794ef7fbcfd8160c8
Kernel Live Patch Security Notice LSN-0035-1
Posted Feb 23, 2018
Authored by Benjamin M. Romer

On February 22, fixes for CVE-2017-5715 were released into the Ubuntu Xenial kernel version 4.4.0-116.140. This CVE, also known as "Spectre," is caused by flaws in the design of speculative execution hardware in the computer's CPU, and could be used to access sensitive information in kernel memory.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2017-5715
MD5 | 95a67778ff266fb5d137537edcd1a426
Kernel Live Patch Security Notice LSN-0034-1
Posted Jan 10, 2018
Authored by Benjamin M. Romer

On January 9, fixes for CVE-2017-5754 were released into the Ubuntu Xenial kernel version 4.4.0-108.131. This CVE, also known as "Meltdown," is a security vulnerability caused by flaws in the design of speculative execution hardware in the computer's CPU.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2017-5754
MD5 | 4974c888dabe678b81c7dea7955b3a4c
Kernel Live Patch Security Notice LSN-0033-1
Posted Dec 9, 2017
Authored by Benjamin M. Romer

Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service (application crashes) or possibly gain administrative privileges. It was discovered that a race condition existed in the ALSA subsystem of the Linux kernel when creating and deleting a port via ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-1000405, CVE-2017-15265, CVE-2017-16939
MD5 | ca77a2333d4c9ee49fdd8d0056475a48
Kernel Live Patch Security Notice LSN-0032-2
Posted Nov 29, 2017
Authored by Benjamin M. Romer

Anthony Perard discovered that the Xen virtual block driver did not properly initialize some data structures before passing them to user space. A local attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs. Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this to cause a denial of service (system crash). It was discovered that the nested KVM implementation in the Linux kernel in some situations did not properly prevent second level guests from reading and writing the hardware CR8 register. A local attacker in a guest could use this to cause a denial of service (system crash). Otto Ebeling discovered that the memory manager in the Linux kernel did not properly check the effective UID in some situations. A local attacker could use this to expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-14140
MD5 | 7da09c1aeaae77a18335cfc81f24b94c
Kernel Live Patch Security Notice LSN-0032-1
Posted Nov 22, 2017
Authored by Benjamin M. Romer

Anthony Perard discovered that the Xen virtual block driver did not properly initialize some data structures before passing them to user space. A local attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs. Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this to cause a denial of service (system crash). It was discovered that the nested KVM implementation in the Linux kernel in some situations did not properly prevent second level guests from reading and writing the hardware CR8 register. A local attacker in a guest could use this to cause a denial of service (system crash). Otto Ebeling discovered that the memory manager in the Linux kernel did not properly check the effective UID in some situations. A local attacker could use this to expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-14140
MD5 | 1b9f090ee2c532a7a8474bdc057dd51d
Kernel Live Patch Security Notice LSN-0031-1
Posted Oct 11, 2017
Authored by Benjamin M. Romer

net/xfrm/xfrm_policy.c in the Linux kernel through 4.12.3, when CONFIG_XFRM_MIGRATE is enabled, does not ensure that the dir value of xfrm_userpolicy_id is XFRM_POLICY_MAX or less, which allows local users to cause a denial of service (out-of-bounds access) or possibly have unspecified other impact via an XFRM_MSG_MIGRATE xfrm Netlink message. Andrey Konovalov discovered that a divide-by-zero error existed in the TCP stack implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash).

tags | advisory, denial of service, kernel, local, tcp
systems | linux
advisories | CVE-2017-11600
MD5 | 06dff9f017da1957172af525b25cfd62
Kernel Live Patch Security Notice LSN-0030-1
Posted Sep 19, 2017
Authored by Benjamin M. Romer

The Linux Kernel running on AMD64 systems will sometimes map the contents of PIE executable, the heap or ld.so to where the stack is mapped allowing attackers to more easily manipulate the stack. It was discovered that a buffer overflow existed in the Bluetooth stack of the Linux kernel when handling L2CAP configuration responses. A physically proximate attacker could use this to cause a denial of service (system crash). It was discovered that the Flash-Friendly File System (f2fs) implementation in the Linux kernel did not properly validate superblock metadata. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-1000251, CVE-2017-1000379, CVE-2017-10663
MD5 | f0f811c3905f66d55df59c33e5694479
Kernel Live Patch Security Notice LSN-0029-1
Posted Aug 30, 2017
Authored by Benjamin M. Romer

It was discovered that the Linux kernel did not honor the UEFI secure boot mode when performing a kexec operation. A local attacker could use this to bypass secure boot restrictions. Huang Weller discovered that the ext4 filesystem implementation in the Linux kernel mishandled a needs-flushing-before-commit list. A local attacker could use this to expose sensitive information.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2015-7837, CVE-2017-7495
MD5 | e1cdddf8c51cfb6dc9e25a8466744db4
Kernel Live Patch Security Notice LSN-0028-1
Posted Aug 18, 2017
Authored by Benjamin M. Romer

Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload (UFO) code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Andrey Konovalov discovered a race condition in AF_PACKET socket option handling code in the Linux kernel. A local unprivileged attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local, udp
systems | linux
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | c8908f6bf286f4cf4b1a6341a51852ff
Kernel Live Patch Security Notice LSN-0027-1
Posted Aug 4, 2017
Authored by Benjamin M. Romer

Fan Wu and Shixiong Zhao discovered a race condition between inotify events and vfs rename operations in the Linux kernel. An unprivileged local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-7533
MD5 | 2c08f5ef5e1bba5027586f30d1c6777f
Kernel Live Patch Security Notice LSN-0026-1
Posted Jul 25, 2017
Authored by Benjamin M. Romer

It was discovered that a use-after-free flaw existed in the filesystem encryption subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel could overflow reference counters on systems with more than 32GB of physical ram and with RLIMIT_MEMLOCK set to infinite. A local unprivileged attacker could use to create a use-after- free situation, causing a denial of service (system crash) or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, overflow, kernel, local
systems | linux
advisories | CVE-2016-4558, CVE-2017-1000365, CVE-2017-7374, CVE-2017-7482, CVE-2017-9150
MD5 | cf9eb0b35f581391cfa449654007aaad
Kernel Live Patch Security Notice LSN-0025-1
Posted Jul 16, 2017
Authored by Benjamin M. Romer

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. It was discovered that the stack guard page for processes in the Linux kernel was not sufficiently large enough to prevent overlapping with the heap. An attacker could leverage this with another vulnerability to execute arbitrary code and gain administrative privileges. Various other vulnerabilities were addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux
advisories | CVE-2016-8632, CVE-2016-9604, CVE-2017-1000364, CVE-2017-2584, CVE-2017-6074, CVE-2017-7346, CVE-2017-7472, CVE-2017-8890, CVE-2017-9074, CVE-2017-9075, CVE-2017-9242
MD5 | f33f9e8f678adbf7a3a32f53939cff60
Kernel Live Patch Security Notice LSN-0024-1
Posted Jun 22, 2017
Authored by Benjamin M. Romer

It was discovered that the stack guard page for processes in the Linux kernel was not sufficiently large enough to prevent overlapping with the heap. An attacker could leverage this with another vulnerability to execute arbitrary code and gain administrative privileges.

tags | advisory, arbitrary, kernel
systems | linux
advisories | CVE-2017-1000364
MD5 | 802d5d0c1e8f0c95c047a7f9331ccb3d
Kernel Live Patch Security Notice LSN-0022-1
Posted May 17, 2017
Authored by Benjamin M. Romer

It was discovered that a use-after-free flaw existed in the filesystem encryption subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). Andreas Gruenbacher and Jan Kara discovered that the filesystem implementation in the Linux kernel did not clear the setgid bit during a setxattr call. A local attacker could use this to possibly elevate group privileges.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2016-7097, CVE-2017-7374
MD5 | c84226cb3f6117859645dc55de9b6c81
Kernel Live Patch Security Notice LSN-0021-1
Posted Apr 15, 2017
Authored by Benjamin M. Romer

Several security issues were fixed in the kernel. Andrey Konovalov discovered that the AF_PACKET implementation in the Linux kernel did not properly validate certain block-size data. A local attacker could use this to cause a denial of service (system crash). Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2016-5195, CVE-2016-7910, CVE-2016-7911, CVE-2016-7912, CVE-2016-7916, CVE-2016-8399, CVE-2016-8630, CVE-2016-8633, CVE-2016-9191, CVE-2016-9555, CVE-2016-9756, CVE-2017-2583, CVE-2017-6074, CVE-2017-7308
MD5 | 878ad898ccfcd692664025f15c5ea754
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