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.

The remote Ubuntu 22.04 LTS / 23.04 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6338-2 advisory.

  - 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-2023-21255)

  - 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-2023-2898)

  - 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. (CVE-2023-31084)

  - 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-2023-32247)

  - 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. (CVE-2023-32250)

  - 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-2023-32252)

  - 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-2023-32257)

  - 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-2023-32258)

  - An issue was discovered in the Linux kernel before 6.3.4. ksmbd has an out-of-bounds read in     smb2_find_context_vals when create_context's name_len is larger than the tag length. (CVE-2023-38426)

  - 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-2023-38428)

  - 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-2023-38429)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 23.04 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6344-1 advisory.

  - 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-2023-21255)

  - 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-2023-2898)

  - 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. (CVE-2023-31084)

  - 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-2023-32247)

  - 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. (CVE-2023-32250)

  - 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-2023-32252)

  - 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-2023-32257)

  - 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-2023-32258)

  - An issue was discovered in the Linux kernel before 6.3.4. ksmbd has an out-of-bounds read in     smb2_find_context_vals when create_context's name_len is larger than the tag length. (CVE-2023-38426)

  - 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-2023-38428)

  - 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-2023-38429)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 23.04 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6338-1 advisory.

  - 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-2023-21255)

  - 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-2023-2898)

  - 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. (CVE-2023-31084)

  - 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-2023-32247)

  - 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. (CVE-2023-32250)

  - 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-2023-32252)

  - 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-2023-32257)

  - 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-2023-32258)

  - An issue was discovered in the Linux kernel before 6.3.4. ksmbd has an out-of-bounds read in     smb2_find_context_vals when create_context's name_len is larger than the tag length. (CVE-2023-38426)

  - 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-2023-38428)

  - 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-2023-38429)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
193375	Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel (AWS) vulnerabilities (USN-6725-2)	Nessus	Ubuntu Local Security Checks	critical
193084	Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-6725-1)	Nessus	Ubuntu Local Security Checks	critical
181189	Ubuntu 22.04 LTS / 23.04 : Linux kernel vulnerabilities (USN-6338-2)	Nessus	Ubuntu Local Security Checks	critical
180558	Ubuntu 23.04 : Linux kernel (Azure) vulnerabilities (USN-6344-1)	Nessus	Ubuntu Local Security Checks	critical
180511	Ubuntu 22.04 LTS / 23.04 : Linux kernel vulnerabilities (USN-6338-1)	Nessus	Ubuntu Local Security Checks	critical

Detections

Analytics

CVE-2023-32258

high

Tenable Plugins

critical

critical

critical

critical

critical