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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202012-21">
<title>Mozilla Network Security Service (NSS): Denial of service</title>
<synopsis>A vulnerability in NSS might allow remote attackers to cause a
Denial of Service condition.
</synopsis>
<product type="ebuild">nss</product>
<announced>2020-12-23</announced>
<revised count="1">2020-12-23</revised>
<bug>750254</bug>
<access>remote</access>
<affected>
<package name="dev-libs/nss" auto="yes" arch="*">
<unaffected range="ge">3.58</unaffected>
<vulnerable range="lt">3.58</vulnerable>
</package>
</affected>
<background>
<p>The Mozilla Network Security Service (NSS) is a library implementing
security features like SSL v.2/v.3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS
#12, S/MIME and X.509 certificates.
</p>
</background>
<description>
<p>A flaw was found in the way Mozilla Network Security Service (NSS)
handled CCS (ChangeCipherSpec) messages in TLS 1.3.
</p>
</description>
<impact type="low">
<p>A remote attacker could send multiple crafted CSS messages in row after
ClientHello message to a server application linked against NSS library,
possibly resulting in a Denial of Service condition.
</p>
</impact>
<workaround>
<p>Disable TLS 1.3 protocol.</p>
</workaround>
<resolution>
<p>All NSS users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/nss-3.58"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/vuln/detail/CVE-2020-25648">CVE-2020-25648</uri>
</references>
<metadata tag="requester" timestamp="2020-12-22T23:13:35Z">whissi</metadata>
<metadata tag="submitter" timestamp="2020-12-23T19:58:04Z">whissi</metadata>
</glsa>
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