HoRNDIS RNDIS Packet Parser HoRNDIS::receivePacket` Negative Value integer overflow

Summaryinfo

A vulnerability labeled as critical has been found in HoRNDIS. The impacted element is the function HoRNDIS::receivePacket` of the component RNDIS Packet Parser. Executing a manipulation as part of Negative Value can lead to integer overflow. The identification of this vulnerability is CVE-2020-15137. The physical device can be targeted for the attack. There is no exploit available.

Detailsinfo

A vulnerability was found in HoRNDIS (the affected version unknown). It has been declared as problematic. This vulnerability affects the function HoRNDIS::receivePacket` of the component RNDIS Packet Parser. The manipulation as part of a Negative Value leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

All versions of HoRNDIS are affected by an integer overflow in the RNDIS packet parsing routines. A malicious USB device can trigger disclosure of unrelated kernel memory to userspace applications on the host, or can cause the kernel to crash. Kernel memory disclosure is especially likely on 32-bit kernels; 64-bit kernels are more likely to crash on attempted exploitation. It is not believed that kernel memory corruption is possible, or that unattended kernel memory disclosure without the collaboration of a userspace program running on the host is possible. The vulnerability is in `HoRNDIS::receivePacket`. `msg_len`, `data_ofs`, and `data_len` can be controlled by an attached USB device, and a negative value of `data_ofs` can bypass the check for `(data_ofs + data_len + 8) > msg_len`, and subsequently can cause a wild pointer copy in the `mbuf_copyback` call. The software is not maintained and no patches are planned. Users of multi-tenant systems with HoRNDIS installed should only connect trusted USB devices to their system.

The weakness was shared 08/12/2020 (GitHub Repository). The advisory is available at github.com. This vulnerability was named CVE-2020-15137 since 06/25/2020. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• HoRNDIS

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