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CVE-2023-52443

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: apparmor: avoid crash when parsed profile name is empty When processing a packed profile in unpack_profile() described like "profile :ns::samba-dcerpcd /usr/lib*/samba/{,samba/}samba-dcerpcd {...}" a string ":samba-dcerpcd" is unpacked as a fully-qualified name and then passed to aa_splitn_fqname(). aa_splitn_fqname() treats ":samba-dcerpcd" as only containing a namespace. Thus it returns NULL for tmpname, meanwhile tmpns is non-NULL. Later aa_alloc_profile() crashes as the new profile name is NULL now. general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 6 PID: 1657 Comm: apparmor_parser Not tainted 6.7.0-rc2-dirty #16 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 RIP: 0010:strlen+0x1e/0xa0 Call Trace: <TASK> ? strlen+0x1e/0xa0 aa_policy_init+0x1bb/0x230 aa_alloc_profile+0xb1/0x480 unpack_profile+0x3bc/0x4960 aa_unpack+0x309/0x15e0 aa_replace_profiles+0x213/0x33c0 policy_update+0x261/0x370 profile_replace+0x20e/0x2a0 vfs_write+0x2af/0xe00 ksys_write+0x126/0x250 do_syscall_64+0x46/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK> ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x1e/0xa0 It seems such behaviour of aa_splitn_fqname() is expected and checked in other places where it is called (e.g. aa_remove_profiles). Well, there is an explicit comment "a ns name without a following profile is allowed" inside. AFAICS, nothing can prevent unpacked "name" to be in form like ":samba-dcerpcd" - it is passed from userspace. Deny the whole profile set replacement in such case and inform user with EPROTO and an explaining message. Found by Linux Verification Center (linuxtesting.org).

Related Files

Ubuntu Security Notice USN-6926-2
Posted Aug 2, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6926-2 - 黄思聪 discovered that the NFC Controller Interface implementation in the Linux kernel did not properly handle certain memory allocation failure conditions, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service. It was discovered that a race condition existed in the Bluetooth subsystem in the Linux kernel when modifying certain settings values through debugfs. A privileged local attacker could use this to cause a denial of service.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-46343, CVE-2023-52435, CVE-2023-52436, CVE-2023-52443, CVE-2023-52444, CVE-2023-52449, CVE-2023-52752, CVE-2024-25739, CVE-2024-25744, CVE-2024-26882, CVE-2024-26901, CVE-2024-26923, CVE-2024-27020, CVE-2024-35978
SHA-256 | 2d46229c1bb410100a951de8431f990f91bf51ba7ec8b3772ca11b05a1a2247c
Ubuntu Security Notice USN-6819-4
Posted Jun 26, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-4 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | 55aee9f86f0d217c785cca08ee7c9f4bcee8a48724cb7c733501904578ab9082
Ubuntu Security Notice USN-6818-4
Posted Jun 19, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6818-4 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. It was discovered that the Intel Data Streaming and Intel Analytics Accelerator drivers in the Linux kernel allowed direct access to the devices for unprivileged users and virtual machines. A local attacker could use this to cause a denial of service.

tags | advisory, remote, denial of service, kernel, local, tcp
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52445, CVE-2023-52447, CVE-2023-52448, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52454, CVE-2023-52455, CVE-2023-52457, CVE-2023-52458, CVE-2023-52462, CVE-2023-52465
SHA-256 | 45d09107b41d33ef414306980ca5ee46652a668706bd63539fc356423258d542
Ubuntu Security Notice USN-6818-3
Posted Jun 17, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6818-3 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. It was discovered that the Intel Data Streaming and Intel Analytics Accelerator drivers in the Linux kernel allowed direct access to the devices for unprivileged users and virtual machines. A local attacker could use this to cause a denial of service.

tags | advisory, remote, denial of service, kernel, local, tcp
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52445, CVE-2023-52447, CVE-2023-52448, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52454, CVE-2023-52455, CVE-2023-52457, CVE-2023-52458, CVE-2023-52462, CVE-2023-52465
SHA-256 | dcff9f0b90830b9039bdc525bab3fafe6a039d75b4aa054c2fed494b9bcc3e2d
Ubuntu Security Notice USN-6819-3
Posted Jun 13, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-3 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | 0776ecd3ecb1bfa0399486a67208c24d784625998b8a8fcde961179d780df009
Ubuntu Security Notice USN-6819-2
Posted Jun 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-2 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | aa4906916aa0bf9376da682c5ed9fb70434203cee9f1f143722bf1febd67513c
Ubuntu Security Notice USN-6818-2
Posted Jun 11, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6818-2 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. It was discovered that the Intel Data Streaming and Intel Analytics Accelerator drivers in the Linux kernel allowed direct access to the devices for unprivileged users and virtual machines. A local attacker could use this to cause a denial of service.

tags | advisory, remote, denial of service, kernel, local, tcp
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52445, CVE-2023-52447, CVE-2023-52448, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52454, CVE-2023-52455, CVE-2023-52457, CVE-2023-52458, CVE-2023-52462, CVE-2023-52465
SHA-256 | 9ba8e27136f85eb9b04e59f45205671bb1e2028060ec6d3762843127fc48c57d
Ubuntu Security Notice USN-6819-1
Posted Jun 10, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-1 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | 6b5f365e0a9b1cc8353c9a51d4e012a3c1a46a05a4cee68676de2559d30b4103
Ubuntu Security Notice USN-6818-1
Posted Jun 10, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6818-1 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. It was discovered that the Intel Data Streaming and Intel Analytics Accelerator drivers in the Linux kernel allowed direct access to the devices for unprivileged users and virtual machines. A local attacker could use this to cause a denial of service.

tags | advisory, remote, denial of service, kernel, local, tcp
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52445, CVE-2023-52447, CVE-2023-52448, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52454, CVE-2023-52455, CVE-2023-52457, CVE-2023-52458, CVE-2023-52462, CVE-2023-52465
SHA-256 | 5778214f1c63875a06eab8b9dbcf68eb5655db57ccbc5ef60ce840cca70d6401
Ubuntu Security Notice USN-6765-1
Posted May 9, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6765-1 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Sander Wiebing, Alvise de Faveri Tron, Herbert Bos, and Cristiano Giuffrida discovered that the Linux kernel mitigations for the initial Branch History Injection vulnerability were insufficient for Intel processors. A local attacker could potentially use this to expose sensitive information.

tags | advisory, remote, denial of service, kernel, local, tcp
systems | linux, ubuntu
advisories | CVE-2022-0001, CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52449, CVE-2023-52451, CVE-2023-52452, CVE-2023-52455, CVE-2023-52456, CVE-2023-52457, CVE-2023-52462, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469
SHA-256 | 42046ab3e597891b35376f855bb093f99f7b85199aebb9184d7401f3b4fa1f10
Ubuntu Security Notice USN-6688-1
Posted Mar 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6688-1 - Pratyush Yadav discovered that the Xen network backend implementation in the Linux kernel did not properly handle zero length data request, leading to a null pointer dereference vulnerability. An attacker in a guest VM could possibly use this to cause a denial of service. It was discovered that the Habana's AI Processors driver in the Linux kernel did not properly initialize certain data structures before passing them to user space. A local attacker could use this to expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-46838, CVE-2023-50431, CVE-2023-52436, CVE-2023-52438, CVE-2023-52439, CVE-2023-52443, CVE-2023-52444, CVE-2023-52445, CVE-2023-52447, CVE-2023-52448, CVE-2023-52449, CVE-2023-52454, CVE-2023-52457, CVE-2023-52462
SHA-256 | 14e46adfe602e3381472cca2694960e60b4f66b2adf1e14c5cefabbd3a423e8c
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