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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201701-31">
<title>flex: Potential insecure code generation</title>
<synopsis>Flex might generate code with a buffer overflow making applications
using such scanners vulnerable to the execution of arbitrary code.
</synopsis>
<product type="ebuild">flex</product>
<announced>2017-01-11</announced>
<revised count="1">2017-01-11</revised>
<bug>589820</bug>
<access>remote</access>
<affected>
<package name="sys-devel/flex" auto="yes" arch="*">
<unaffected range="ge">2.6.1</unaffected>
<vulnerable range="lt">2.6.1</vulnerable>
</package>
</affected>
<background>
<p>flex is a programming tool used to generate scanners (programs which
recognize lexical patterns in text).
</p>
</background>
<description>
<p>A heap-based buffer overflow in the yy_get_next_buffer function in Flex
might allow context-dependent attackers to cause a denial of service or
possibly execute arbitrary code via vectors involving num_to_read.
</p>
</description>
<impact type="normal">
<p>Context-dependent attackers could cause a Denial of Service condition or
possibly execute arbitrary code with the privileges of the process.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All flex users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=sys-devel/flex-2.6.1"
</code>
<p>Packages which depend on flex may need to be recompiled. Tools such as
qdepends (included in app-portage/portage-utils) may assist in
identifying these packages:
</p>
<code>
# emerge --oneshot --ask --verbose $(qdepends -CQ sys-devel/flex | sed
's/^/=/')
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-6354">CVE-2016-6354</uri>
</references>
<metadata tag="requester" timestamp="2017-01-09T14:07:40Z">whissi</metadata>
<metadata tag="submitter" timestamp="2017-01-11T12:41:44Z">whissi</metadata>
</glsa>