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role=treeitem href=/v1.2/about/notes/1.2.5/>Istio 1.2.5</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.13/>Istio 1.1.13</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.2.4/>Istio 1.2.4</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.12/>Istio 1.1.12</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.2.3/>Istio 1.2.3</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.11/>Istio 1.1.11</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.9/>Istio 1.0.9</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.10/>Istio 1.1.10</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.2.2/>Istio 1.2.2</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.2.1/>Istio 1.2.1</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.2/>Istio 1.2</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.9/>Istio 1.1.9</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.8/>Istio 1.0.8</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.8/>Istio 1.1.8</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.7/>Istio 1.1.7</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.6/>Istio 1.1.6</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.5/>Istio 1.1.5</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.4/>Istio 1.1.4</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.3/>Istio 1.1.3</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.7/>Istio 1.0.7</a></li><li role=none><span role=treeitem class=current>Istio 1.1.2</span></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1.1/>Istio 1.1.1</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.1/>Istio 1.1</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.6/>Istio 1.0.6</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.5/>Istio 1.0.5</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.4/>Istio 1.0.4</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.3/>Istio 1.0.3</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.2/>Istio 1.0.2</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0.1/>Istio 1.0.1</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/1.0/>Istio 1.0</a></li><li role=treeitem aria-label="Older Notes"><button aria-hidden=true></button><a title="Notes from older releases of Istio." href=/v1.2/about/notes/older/>Older Notes</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem href=/v1.2/about/notes/older/0.8/>Istio 0.8</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/older/0.7/>Istio 0.7</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/older/0.6/>Istio 0.6</a></li><li role=none><a role=treeitem href=/v1.2/about/notes/older/0.5/>Istio 0.5</a></li><li role=none><a role=treeitem 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href=/v1.2/about/community/join/>Getting Involved</a></li><li role=none><a role=treeitem title="Who's building stuff around Istio." href=/v1.2/about/community/partners/>Partners</a></li><li role=none><a role=treeitem title="Who's using Istio out there." href=/v1.2/about/community/customers/>Istio in Action</a></li></ul></li><li role=none><a role=treeitem title="What to do if you find a bug." href=/v1.2/about/bugs/>Reporting Bugs</a></li><li role=none><a role=treeitem title="How we handle security vulnerabilities." href=/v1.2/about/security-vulnerabilities/>Security Vulnerabilities</a></li><li role=none><a role=treeitem title="Official Istio resources for digital and printed materials." href=/v1.2/about/media-resources/>Media Resources</a></li><li role=treeitem aria-label="Contributing to the Docs"><button aria-hidden=true></button><a title="Learn how to contribute to improve and expand the Istio documentation." href=/v1.2/about/contribute/>Contributing to the Docs</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Explains the mechanics of creating and maintaining documentation pages." href=/v1.2/about/contribute/creating-and-editing-pages/>Creating and Editing Pages</a></li><li role=none><a role=treeitem title="Explains the dos and donts of writing Istio documentation." href=/v1.2/about/contribute/style-guide/>Style Guide</a></li><li role=none><a role=treeitem title="Shows you how to use GitHub to work on Istio documentation." href=/v1.2/about/contribute/github/>Working with GitHub</a></li><li role=none><a role=treeitem title="Provides assets and instructions to create diagrams for the Istio documentation." href=/v1.2/about/contribute/diagrams/>Diagram Creation Guidelines</a></li></ul></li></ul></div></div></div></nav></div><div class=article-container><button tabindex=-1 id=sidebar-toggler title="Toggle the navigation bar"><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#pull"/></svg></button><nav aria-label=Breadcrumb><ol><li><a href=/v1.2/ title="Connect, secure, control, and observe services.">Istio</a></li><li><a href=/v1.2/about/ title="Get a bit more in-depth info about the Istio project.">About</a></li><li><a href=/v1.2/about/notes/ title="Description of features and improvements for every Istio release.">Release Notes</a></li><li>Istio 1.1.2</li></ol></nav><article aria-labelledby=title><div class=title-area><i class=title-icon><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#notes"/></svg></i><div><h1 id=title>Istio 1.1.2</h1><p class=byline><span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#calendar"/></svg><span> </span>April 5, 2019</span><span> | </span><span title="618 words"><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#clock"/></svg><span> </span>3 minute read</span></p></div></div><nav class=toc-inlined aria-label="Table of Contents"><div><hr><ol><li role=none aria-label="Security update"><a href=#security-update>Security update</a><li role=none aria-label="Affected Istio releases"><a href=#affected-istio-releases>Affected Istio releases</a><li role=none aria-label="Vulnerability impact"><a href=#vulnerability-impact>Vulnerability impact</a><li role=none aria-label=Mitigation><a href=#mitigation>Mitigation</a><li role=none aria-label="Detection of NUL header exploit"><a href=#detection-of-nul-header-exploit>Detection of NUL header exploit</a><li role=none aria-label="Detection of path traversal exploit"><a href=#detection-of-path-traversal-exploit>Detection of path traversal exploit</a></ol><hr></div></nav><p>This release includes an important security update. All customers using prior versions of Istio are advised to upgrade immediately.</p><div class=call-to-action><button class="btn update-notice" data-title="Update Notice" data-downloadhref=https://github.com/istio/istio/releases/tag/1.1.2 data-updateadvice="Before you download 1.1.2, you should know that there's a newer patch release with the latest bug fixes and perf improvements." data-updatebutton="LEARN ABOUT ISTIO 1.1.14" data-updatehref=/v1.2/about/notes/1.1.14>
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DOWNLOAD 1.1.2</button>
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<a class=btn href=https://archive.istio.io/v1.1>1.1.2 DOCS</a>
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<a class=btn href=https://github.com/istio/istio/compare/1.1.1...1.1.2>CHANGES IN 1.1.2</a></div><h2 id=security-update>Security update</h2><p>Two security vulnerabilities have recently been identified in the Envoy proxy
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(<a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9900">CVE 2019-9900</a> and <a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9901">CVE 2019-9901</a>). The
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vulnerabilities have now been patched in Envoy version 1.9.1, and correspondingly in the Envoy builds
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embedded in Istio 1.1.2 and Istio 1.0.7. Since Envoy is an integral part of Istio, users are advised to update Istio
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immediately to mitigate security risks arising from these vulnerabilities.</p><p>The vulnerabilities are centered on the fact that Envoy did not normalize HTTP URI paths and did not fully validate HTTP/1.1 header values. These
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vulnerabilities impact Istio features that rely on Envoy to enforce any of authorization, routing, or rate limiting.</p><h2 id=affected-istio-releases>Affected Istio releases</h2><p>The following Istio releases are vulnerable:</p><ul><li><p>1.1, 1.1.1</p><ul><li>These releases can be patched to Istio 1.1.2.</li><li>1.1.2 is built from the same source as 1.1.1 with the addition of Envoy patches minimally sufficient to address the CVEs.</li></ul></li><li><p>1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6</p><ul><li>These releases can be patched to Istio 1.0.7</li><li>1.0.7 is built from the same source as 1.0.6 with the addition of Envoy patches minimally sufficient to address the CVEs.</li></ul></li><li><p>0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8</p><ul><li>These releases are no longer supported and will not be patched. Please upgrade to a supported release with the necessary fixes.</li></ul></li></ul><h2 id=vulnerability-impact>Vulnerability impact</h2><p><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9900">CVE 2019-9900</a> and <a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9901">CVE 2019-9901</a>
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allow remote attackers access to unauthorized resources by using specially crafted request URI paths (9901) and NUL bytes in
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HTTP/1.1 headers (9900), potentially circumventing DoS prevention systems such as rate limiting, or routing to a unexposed upstream system. Refer to
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<a href=https://github.com/envoyproxy/envoy/issues/6434>issue 6434</a>
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and <a href=https://github.com/envoyproxy/envoy/issues/6435>issue 6435</a> for more information.</p><p>As Istio is based on Envoy, Istio customers can be affected by these vulnerabilities based on whether paths and request headers are used within Istio
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policies or routing rules and how the backend HTTP implementation resolves them. If prefix path matching rules are used by Mixer or by Istio authorization
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policies or the routing rules, an attacker could exploit these vulnerabilities to gain access to unauthorized paths on certain HTTP backends.</p><h2 id=mitigation>Mitigation</h2><p>Eliminating the vulnerabilities requires updating to a corrected version of Envoy. We’ve incorporated the necessary updates in the latest Istio patch releases.</p><p>For Istio 1.1.x deployments: update to a minimum of <a href=/v1.2/about/notes/1.1.2>Istio 1.1.2</a></p><p>For Istio 1.0.x deployments: update to a minimum of <a href=/v1.2/about/notes/1.0.7>Istio 1.0.7</a></p><p>While Envoy 1.9.1 requires opting in to path normalization to address CVE 2019-9901, the version of Envoy embedded in Istio 1.1.2 and 1.0.7 enables path
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normalization by default.</p><h2 id=detection-of-nul-header-exploit>Detection of NUL header exploit</h2><p>Based on current information, this only affects HTTP/1.1 traffic. If this is not structurally possible in your network or configuration, then it is unlikely
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that this vulnerability applies.</p><p>File-based access logging uses the <code>c_str()</code> representation for header values, as does gRPC access logging, so there will be no trivial detection via
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Envoy’s access logs by scanning for NUL. Instead, operators might look for inconsistencies in logs between the routing that Envoy performs and the logic
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intended in the <code>RouteConfiguration</code>.</p><p>External authorization and rate limit services can check for NULs in headers. Backend servers might have sufficient logging to detect NULs or unintended
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access; it’s likely that many will simply reject NULs in this scenario via 400 Bad Request, as per RFC 7230.</p><h2 id=detection-of-path-traversal-exploit>Detection of path traversal exploit</h2><p>Envoy’s access logs (whether file-based or gRPC) will contain the unnormalized path, so it is possible to examine these logs to detect suspicious patterns and
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requests that are incongruous with the intended operator configuration intent. In addition, unnormalized paths are available at <code>ext_authz</code>, rate limiting
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and backend servers for log inspection.</p></article><nav class=pagenav><div class=left><a href=/v1.2/about/notes/1.0.7/><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#left-arrow"/></svg>Istio 1.0.7</a></div><div class=right><a href=/v1.2/about/notes/1.1.1/>Istio 1.1.1<svg class="icon"><use xlink:href="/v1.2/img/icons.svg#right-arrow"/></svg></a></div></nav><div id=endnotes-container aria-hidden=true><h2>Links</h2><ol id=endnotes></ol></div></div><div class=toc-container><nav class=toc aria-label="Table of Contents"><div id=toc><ol><li role=none aria-label="Security update"><a href=#security-update>Security update</a><li role=none aria-label="Affected Istio releases"><a href=#affected-istio-releases>Affected Istio releases</a><li role=none aria-label="Vulnerability impact"><a href=#vulnerability-impact>Vulnerability impact</a><li role=none aria-label=Mitigation><a href=#mitigation>Mitigation</a><li role=none aria-label="Detection of NUL header exploit"><a href=#detection-of-nul-header-exploit>Detection of NUL header exploit</a><li role=none aria-label="Detection of path traversal exploit"><a href=#detection-of-path-traversal-exploit>Detection of path traversal exploit</a></ol></div></nav></div></main><footer><div class=user-links><a class=channel title="Go download Istio 1.2.5 now" href=https://github.com/istio/istio/releases/tag/1.2.5 aria-label="Download Istio"><span>download</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#download"/></svg>
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</a><a class=channel title="Join the Istio discussion board to participate in discussions and get help troubleshooting problems" href=https://discuss.istio.io aria-label="Istio discussion board"><span>discuss</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#discourse"/></svg></a>
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<a class=channel title="Stack Overflow is where you can ask questions and find curated answers on deploying, configuring, and using Istio" href=https://stackoverflow.com/questions/tagged/istio aria-label="Stack Overflow"><span>stack overflow</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#stackoverflow"/></svg></a>
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<a class=channel title="Interactively discuss issues with the Istio community on Slack" href=https://istio.slack.com aria-label=slack><span>slack</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#slack"/></svg></a>
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1.2.5<br>© 2019 Istio Authors, <a href=https://policies.google.com/privacy>Privacy Policy</a><br>Archived on September 12, 2019</p></div><div class=dev-links><a class=channel title="GitHub is where development takes place on Istio code" href=https://github.com/istio/community aria-label=GitHub><span>github</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#github"/></svg></a>
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<a class=channel title="Access our team drive if you'd like to take a look at the Istio technical design documents" href=https://groups.google.com/forum/#!forum/istio-team-drive-access aria-label="team drive"><span>drive</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#drive"/></svg></a>
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