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Ubuntu Security Notice USN-6338-2

Ubuntu Security Notice 6338-2 - Zi Fan Tan discovered that the binder IPC implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the f2fs file system in the Linux kernel, leading to a null pointer dereference vulnerability. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service.

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==========================================================================Ubuntu Security Notice USN-6338-2September 08, 2023linux-gcp, linux-gcp-6.2, linux-ibm, linux-oracle, linux-starfivevulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 23.04- Ubuntu 22.04 LTSSummary:Several security issues were fixed in the Linux kernel.Software Description:- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems- linux-ibm: Linux kernel for IBM cloud systems- linux-oracle: Linux kernel for Oracle Cloud systems- linux-starfive: Linux kernel for StarFive processors- linux-gcp-6.2: Linux kernel for Google Cloud Platform (GCP) systemsDetails:Zi Fan Tan discovered that the binder IPC implementation in the Linuxkernel contained a use-after-free vulnerability. A local attacker could usethis to cause a denial of service (system crash) or possibly executearbitrary code. (CVE-2023-21255)It was discovered that a race condition existed in the f2fs file system inthe Linux kernel, leading to a null pointer dereference vulnerability. Anattacker could use this to construct a malicious f2fs image that, whenmounted and operated on, could cause a denial of service (system crash).(CVE-2023-2898)It was discovered that the DVB Core driver in the Linux kernel did notproperly handle locking events in certain situations. A local attackercould use this to cause a denial of service (kernel deadlock).(CVE-2023-31084)Quentin Minster discovered that the KSMBD implementation in the Linuxkernel did not properly handle session setup requests. A remote attackercould possibly use this to cause a denial of service (memory exhaustion).(CVE-2023-32247)Quentin Minster discovered that a race condition existed in the KSMBDimplementation in the Linux kernel when handling sessions operations. Aremote attacker could use this to cause a denial of service (system crash)or possibly execute arbitrary code. (CVE-2023-32250, CVE-2023-32252,CVE-2023-32257)It was discovered that a race condition existed in the KSMBD implementationin the Linux kernel when handling session connections, leading to a use-after-free vulnerability. A remote attacker could use this to cause adenial of service (system crash) or possibly execute arbitrary code.(CVE-2023-32258)It was discovered that the KSMBD implementation in the Linux kernel did notproperly validate buffer sizes in certain operations, leading to an out-of-bounds read vulnerability. A remote attacker could use this to cause adenial of service (system crash) or possibly expose sensitive information.(CVE-2023-38426, CVE-2023-38428)It was discovered that the KSMBD implementation in the Linux kernel did notproperly calculate the size of certain buffers. A remote attacker could usethis to cause a denial of service (system crash) or possibly executearbitrary code. (CVE-2023-38429)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 23.04:  linux-image-6.2.0-1004-starfive  6.2.0-1004.5  linux-image-6.2.0-1009-ibm      6.2.0-1009.9  linux-image-6.2.0-1011-oracle   6.2.0-1011.11  linux-image-6.2.0-1013-gcp      6.2.0-1013.13  linux-image-gcp                 6.2.0.1013.13  linux-image-ibm                 6.2.0.1009.9  linux-image-oracle              6.2.0.1011.11  linux-image-starfive            6.2.0.1004.7Ubuntu 22.04 LTS:  linux-image-6.2.0-1013-gcp      6.2.0-1013.13~22.04.1  linux-image-gcp                 6.2.0.1013.13~22.04.1After a standard system update you need to reboot your computer to makeall the necessary changes.ATTENTION: Due to an unavoidable ABI change the kernel updates havebeen given a new version number, which requires you to recompile andreinstall all third party kernel modules you might have installed.Unless you manually uninstalled the standard kernel metapackages(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,linux-powerpc), a standard system upgrade will automatically performthis as well.References:  https://ubuntu.com/security/notices/USN-6338-2  https://ubuntu.com/security/notices/USN-6338-1  CVE-2023-21255, CVE-2023-2898, CVE-2023-31084, CVE-2023-32247,  CVE-2023-32250, CVE-2023-32252, CVE-2023-32257, CVE-2023-32258,  CVE-2023-38426, CVE-2023-38428, CVE-2023-38429Package Information:  https://launchpad.net/ubuntu/+source/linux-gcp/6.2.0-1013.13  https://launchpad.net/ubuntu/+source/linux-ibm/6.2.0-1009.9  https://launchpad.net/ubuntu/+source/linux-oracle/6.2.0-1011.11  https://launchpad.net/ubuntu/+source/linux-starfive/6.2.0-1004.5  https://launchpad.net/ubuntu/+source/linux-gcp-6.2/6.2.0-1013.13~22.04.1

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Ubuntu Security Notice 6338-1 - Zi Fan Tan discovered that the binder IPC implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the f2fs file system in the Linux kernel, leading to a null pointer dereference vulnerability. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service.

Ubuntu Security Notice USN-6338-1

Ubuntu Security Notice 6338-1 - Zi Fan Tan discovered that the binder IPC implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the f2fs file system in the Linux kernel, leading to a null pointer dereference vulnerability. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service.

Ubuntu Security Notice USN-6338-1

Ubuntu Security Notice 6338-1 - Zi Fan Tan discovered that the binder IPC implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the f2fs file system in the Linux kernel, leading to a null pointer dereference vulnerability. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service.

Ubuntu Security Notice USN-6338-1

Ubuntu Security Notice 6338-1 - Zi Fan Tan discovered that the binder IPC implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the f2fs file system in the Linux kernel, leading to a null pointer dereference vulnerability. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service.

Ubuntu Security Notice USN-6327-1

Ubuntu Security Notice 6327-1 - Zheng Zhang discovered that the device-mapper implementation in the Linux kernel did not properly handle locking during table_clear operations. A local attacker could use this to cause a denial of service. It was discovered that a use-after-free vulnerability existed in the HFS+ file system implementation in the Linux kernel. A local attacker could possibly use this to cause a denial of service.

Debian Security Advisory 5480-1

Debian Linux Security Advisory 5480-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

Debian Security Advisory 5480-1

Debian Linux Security Advisory 5480-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

Debian Security Advisory 5480-1

Debian Linux Security Advisory 5480-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

Ubuntu Security Notice USN-6285-1

Ubuntu Security Notice 6285-1 - It was discovered that the NTFS file system implementation in the Linux kernel did not properly check buffer indexes in certain situations, leading to an out-of-bounds read vulnerability. A local attacker could possibly use this to expose sensitive information. Stonejiajia, Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in the Ubuntu Linux kernel did not properly perform permission checks in certain situations. A local attacker could possibly use this to gain elevated privileges.

CVE-2023-32252: ZDI-23-700

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_LOGOFF commands. The issue results from the lack of proper validation of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

CVE-2023-32257: ZDI-23-705

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

CVE-2023-32258: Invalid Bug ID

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_LOGOFF and SMB2_CLOSE commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

CVE-2023-32247: Invalid Bug ID

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

CVE-2023-38428

An issue was discovered in the Linux kernel before 6.3.4. fs/ksmbd/smb2pdu.c in ksmbd does not properly check the UserName value because it does not consider the address of security buffer, leading to an out-of-bounds read.

CVE-2023-38429

An issue was discovered in the Linux kernel before 6.3.4. fs/ksmbd/connection.c in ksmbd has an off-by-one error in memory allocation (because of ksmbd_smb2_check_message) that may lead to out-of-bounds access.

CVE-2023-21255

In multiple functions of binder.c, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

CVE-2023-21256: Android Security Bulletin—July 2023

In SettingsHomepageActivity.java, there is a possible way to launch arbitrary activities via Settings due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation.

CVE-2023-32250: Invalid Bug ID

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Debian Security Advisory 5448-1

Debian Linux Security Advisory 5448-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

Debian Security Advisory 5448-1

Debian Linux Security Advisory 5448-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

CVE-2023-2898: [f2fs-dev] [PATCH] f2fs: fix to avoid NULL pointer dereference f2fs_write_end_io()

There is a null-pointer-dereference flaw found in f2fs_write_end_io in fs/f2fs/data.c in the Linux kernel. This flaw allows a local privileged user to cause a denial of service problem.

CVE-2023-31084: BUG: WARNING in dvb_frontend_get_event - Yu Hao

An issue was discovered in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel 6.2. There is a blocking operation when a task is in !TASK_RUNNING. In dvb_frontend_get_event, wait_event_interruptible is called; the condition is dvb_frontend_test_event(fepriv,events). In dvb_frontend_test_event, down(&fepriv->sem) is called. However, wait_event_interruptible would put the process to sleep, and down(&fepriv->sem) may block the process.

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