<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="201903-02"> <title>Zsh: User-assisted execution of arbitrary code</title> <synopsis>Input validation errors in Zsh could result in arbitrary code execution. </synopsis> <product type="ebuild">zsh</product> <announced>2019-03-10</announced> <revised count="1">2019-03-10</revised> <bug>665278</bug> <access>local, remote</access> <affected> <package name="app-shells/zsh" auto="yes" arch="*"> <unaffected range="ge">5.6</unaffected> <vulnerable range="lt">5.6</vulnerable> </package> </affected> <background> <p>A shell designed for interactive use, although it is also a powerful scripting language. </p> </background> <description> <p>Two input validation errors have been discovered in how Zsh parses scripts: </p> <ul> <li>Parsing a malformed shebang line could cause Zsh to call a program listed in the second line (CVE-2018-0502) </li> <li>Shebang lines longer than 64 characters are truncated (CVE-2018-13259) </li> </ul> </description> <impact type="normal"> <p>An attacker could entice a user to execute a specially crafted script using Zsh, possibly resulting in execution of 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 Zsh users should upgrade to the latest version:</p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/zsh-5.6" </code> </resolution> <references> <uri link="https://nvd.nist.gov/vuln/detail/CVE-2018-0502">CVE-2018-0502</uri> <uri link="https://nvd.nist.gov/vuln/detail/CVE-2018-13259">CVE-2018-13259</uri> </references> <metadata tag="requester" timestamp="2018-12-31T07:32:39Z">Zlogene</metadata> <metadata tag="submitter" timestamp="2019-03-10T02:21:31Z">ackle</metadata> </glsa>