CVE-2009-0537: Microsoft Interix

Medium severity, CVSS 4.9. EPSS: 3.6% chance of exploitation in the next 30 days.

Integer overflow in the fts_build function in fts.c in libc in (1) OpenBSD 4.4 and earlier and (2) Microsoft Interix 6.0 build 10.0.6030.0 allows context-dependent attackers to cause a denial of service (application crash) via a deep directory tree, related to the fts_level structure member, as demonstrated by (a) du, (b) rm, (c) chmod, and (d) chgrp on OpenBSD; and (e) SearchIndexer.exe on Vista Enterprise.

Affected products

• Microsoft Interix: version 6.0 only
• OpenBSD OpenBSD: up to and including 4.4; version 2.0 only; version 2.1 only; version 2.2 only; version 2.3 only; version 2.4 only; …

Published 2009-03-09. Last modified 2026-06-16.