214 lines
8.3 KiB
ReStructuredText
214 lines
8.3 KiB
ReStructuredText
.. _asa:
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Security Advisory
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#################
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Addressed in ACRN v2.6
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************************
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We recommend that all developers upgrade to this v2.6 release (or later), which
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addresses the following security issue discovered in previous releases:
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-----
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- Memory leakage vulnerability in ``devicemodel/hw/pci/xhci.c``
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De-initializing of emulated USB devices results in a memory leakage issue
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as some resources allocated for transfer are not properly released.
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**Affected Release:** v2.5 and earlier.
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Addressed in ACRN v2.5
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************************
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We recommend that all developers upgrade to this v2.5 release (or later), which
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addresses the following security issues that were discovered in previous releases:
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-----
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- NULL Pointer Dereference in ``devicemodel/hw/pci/virtio/virtio_net.c``
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``virtio_net_ping_rxq()`` function tries to set ``vq->used->flags`` without
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validating pointer ``vq->used``, which may be NULL and cause a NULL pointer dereference.
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**Affected Release:** v2.4 and earlier.
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- NULL Pointer Dereference in ``hw/pci/virtio/virtio.c``
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``vq_endchains`` function tries to read ``vq->used->idx`` without
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validating pointer ``vq->used``, which may be NULL and cause a NULL pointer dereference.
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**Affected Release:** v2.4 and earlier.
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- NULL Pointer Dereference in ``devicemodel/hw/pci/xhci.c``
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The ``trb`` pointer in ``pci_xhci_complete_commands`` function may be from user space and may be NULL.
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Accessing it without validating may cause a NULL pointer dereference.
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**Affected Release:** v2.4 and earlier.
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- Buffer overflow in ``hypervisor/arch/x86/vtd.c``
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Malicious input ``index`` for function ``dmar_free_irte`` may trigger buffer
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overflow on array ``irte_alloc_bitmap[]``.
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**Affected Release:** v2.4 and earlier.
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- Page Fault in ``devicemodel/core/mem.c``
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``unregister_mem_int()`` function frees any entry when it is valid, which is not expected.
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(only entries to be removed from RB tree can be freed). This will cause a page fault
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when next RB tree iteration happens.
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**Affected Release:** v2.4 and earlier
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- Heap-use-after-free happens in VIRTIO timer_handler
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With virtio polling mode enabled, a timer is running in the virtio
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backend service. The timer will also be triggered if its frontend
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driver didn't do the device reset on shutdown. A freed virtio device
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could be accessed in the polling timer handler.
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**Affected Release:** v2.4 and earlier
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Addressed in ACRN v2.3
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************************
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We recommend that all developers upgrade to this v2.3 release (or later), which
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addresses the following security issue that was discovered in previous releases:
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-----
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- NULL Pointer Dereference in ``devicemodel\hw\pci\virtio\virtio_mei.c``
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``vmei_proc_tx()`` function tries to find the ``iov_base`` by calling
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function ``paddr_guest2host()``, which may return NULL (the ``vd``
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struct control by the User VM OS). There is a use of ``iov_base``
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afterward that can cause a NULL pointer dereference (CVE-2020-28346).
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**Affected Release:** v2.2 and earlier.
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Addressed in ACRN v2.1
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************************
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We recommend that all developers upgrade to this v2.1 release (or later), which
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addresses the following security issue that was discovered in previous releases:
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-----
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- Missing access control restrictions in the Hypervisor component
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A malicious entity with root access in the Service VM
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userspace could abuse the PCIe assign/de-assign Hypercalls via crafted
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ioctls and payloads. This attack can result in a corrupt state and Denial
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of Service (DoS) for previously assigned PCIe devices to the Service VM
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at runtime.
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**Affected Release:** v2.0 and v1.6.1.
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Addressed in ACRN v1.6.1
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************************
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We recommend that all developers upgrade to this v1.6.1 release (or later), which
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addresses the following security issue that was discovered in previous releases:
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-----
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- Service VM kernel Crashes When Fuzzing HC_ASSIGN_PCIDEV and HC_DEASSIGN_PCIDEV
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NULL pointer dereference due to invalid address of PCI device to be assigned or
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de-assigned may result in kernel crash. The return value of 'pci_find_bus()' shall
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be validated before using in 'update_assigned_vf_state()'.
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**Affected Release:** v1.6.
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Addressed in ACRN v1.6
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**********************
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We recommend that all developers upgrade to this v1.6 release (or later), which
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addresses the following security issues that were discovered in previous releases:
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-----
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- Hypervisor Crashes When Fuzzing HC_DESTROY_VM
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The input 'vdev->pdev' should be validated properly when handling
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HC_SET_PTDEV_INTR_INFO to ensure that the physical device is linked to
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'vdev'; otherwise, the hypervisor crashes when fuzzing the
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hypercall HC_DESTROY_VM with crafted input.
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**Affected Release:** v1.5 and earlier.
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- Hypervisor Crashes When Fuzzing HC_VM_WRITE_PROTECT_PAGE
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The input GPA is not validated when handling this hypercall; an "Invalid
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GPA" that is not in the scope of the target VM's EPT address space results
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in the hypervisor crashing when handling this hypercall.
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**Affected Release:** v1.4 and earlier.
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- Hypervisor Crashes When Fuzzing HC_NOTIFY_REQUEST_FINISH
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The input is not validated properly when handing this hypercall;
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'vcpu_id' should be less than 'vm->hw.created_vcpus' instead of
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'MAX_VCPUS_PER_VM'. When the software fails to validate input properly,
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the hypervisor crashes when handling crafted inputs.
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**Affected Release:** v1.4 and earlier.
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Addressed in ACRN v1.4
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**********************
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We recommend that all developers upgrade to this v1.4 release (or later), which
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addresses the following security issues that were discovered in previous releases:
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-----
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- Mitigation for Machine Check Error on Page Size Change
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Improper invalidation for page table updates by a virtual guest operating
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system for multiple Intel(R) Processors may allow an authenticated user
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to potentially enable denial of service of the host system via local
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access. A malicious guest kernel could trigger this issue, CVE-2018-12207.
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**Affected Release:** v1.3 and earlier.
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- AP Trampoline Is Accessible to the Service VM
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This vulnerability is triggered when validating the memory isolation
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between the VM and the hypervisor. The AP Trampoline code exists in the
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LOW_RAM region of the hypervisor but is potentially accessible to the
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Service VM. This could be used by an attacker to mount DoS attacks on the
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hypervisor if the Service VM is compromised.
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**Affected Release:** v1.3 and earlier.
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- Improper Usage Of the ``LIST_FOREACH()`` Macro
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Testing discovered that the MACRO ``LIST_FOREACH()`` was incorrectly used
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in some cases which could induce a "wild pointer" and cause the ACRN
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Device Model to crash. Attackers can potentially use this issue to cause
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denial of service (DoS) attacks.
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**Affected Release:** v1.3 and earlier.
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- Hypervisor Crashes When Fuzzing HC_SET_CALLBACK_VECTOR
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This vulnerability was reported by the Fuzzing tool for the debug version
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of ACRN. When the software fails to validate input properly, an attacker
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is able to craft the input in a form that is not expected by the rest of
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the application. This can lead to parts of the system receiving
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unintended inputs, which may result in an altered control flow, arbitrary
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control of a resource, or arbitrary code execution.
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**Affected Release:** v1.3 and earlier.
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- FILE Pointer Is Not Closed After Using
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This vulnerability was reported by the Fuzzing tool. Leaving the file
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unclosed will cause a leaking file descriptor and may cause unexpected
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errors in the Device Model program.
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**Affected Release:** v1.3 and earlier.
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- Descriptor of Directory Stream Is Referenced After Release
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This vulnerability was reported by the Fuzzing tool. A successful call to
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``closedir(DIR *dirp)`` also closes the underlying file descriptor
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associated with ``dirp``. Access to the released descriptor may point to
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some arbitrary memory location or cause undefined behavior.
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**Affected Release:** v1.3 and earlier.
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- Mutex Is Potentially Kept in a Locked State Forever
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This vulnerability was reported by the Fuzzing tool. Here,
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pthread_mutex_lock/unlock pairing was not always done. Leaving a mutex in
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a locked state forever can cause program deadlock, depending on the usage
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scenario.
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**Affected Release:** v1.3 and earlier.
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