Description (CNA)
A time-of-check to time-of-use (TOCTOU) flaw in the illumos data-link pseudo-driver (dld) affects handling of the DLDIOC_GETMACPROP and DLDIOC_SETMACPROP ioctls on /dev/dld. drv_ioc_prop_common() in usr/src/uts/common/io/dld/dld_drv.c copies the dld_ioc_macprop_t ioctl header in once to read its pr_valsize field, sizes and allocates a kernel heap buffer from that value, and then copies the full request in a second time from the same unprivileged user address. A concurrent thread can enlarge pr_valsize between the two copyins, so the second copyin and the subsequent property handling write beyond the end of the undersized allocation and corrupt the kernel heap. An unprivileged local user, including one confined to a non-global zone that owns a datalink, can trigger this to panic the system. The resulting kernel heap corruption may be usable for further compromise.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| illumos / illumos-gate | affected eae72b5b807baa9116e64502cbb278edf15f3146 before 6959feb5b430411a4809b06c53dcdb42fb525eac |
| OmniOS / OmniOS | affected any before r151054; affected r151058 before r151058j; affected r151056 before r151056aj; affected r151054 before r151054bj |
| Triton Data Center / SmartOS | affected any before 202060709 |
CWE
CWE-367, CWE-122
References
- https://illumos.topicbox.com/groups/developer/T923147fae854a738-M03c29e1be33dac2a5e3d9535/18020-double-copyin-of-dldioc-consumers
- https://illumos.org/issues/18020
- https://github.com/illumos/illumos-gate/commit/6959feb5b430411a4809b06c53dcdb42fb525eac
ADP enrichment
No English description supplied.
No references supplied.