CVE-2021-32845 Information

Description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit the implementation of qnotify at pci_vtrnd_notify fails to check the return value of vq_getchain. This leads to struct iovec iov; being uninitialized and used to read memory in len = (int) read(sc->vrsc_fd iov.iov_base iov.iov_len); when an attacker is able to make vq_getchain fail. This issue may lead to a guest crashing the host causing a denial of service and under certain circumstance memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.

Reference

https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948 https://github.com/moby/hyperkit/pull/313 https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/