CVE-2020-15137 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Reference

https://github.com/jwise/HoRNDIS/security/advisories/GHSA-8q4r-m3rh-57jx

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.9