Directory traversal vulnerability in Apache 1.3.29 and earlier, and Apache 2.0.48 and earlier, when running on Cygwin, allows remote attackers to read arbitrary files via a URL containing "..%5C" (dot dot encoded backslash) sequences.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15293
http://www.apacheweek.com/issues/04-03-12
http://secunia.com/advisories/10962
http://marc.info/?l=bugtraq&m=107765545431387&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-February/017740.html