CVE-2021-32845
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-908, CWE-252
- Affected
- mobyproject/hyperkit
- Source
- security-advisories@github.com
References
- https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948Patch
- https://github.com/moby/hyperkit/pull/313Patch
- https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/Third Party Advisory
- https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948Patch
- https://github.com/moby/hyperkit/pull/313Patch
- https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.