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56 lines
1.9 KiB
56 lines
1.9 KiB
3 years ago
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="202105-11">
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<title>GNU Screen: User-assisted execution of arbitrary code</title>
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<synopsis>A vulnerability in GNU screen may allow a remote attacker to
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execute arbitrary code.
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</synopsis>
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<product type="ebuild">screen</product>
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<announced>2021-05-26</announced>
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<revised count="1">2021-05-26</revised>
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<bug>769770</bug>
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<access>local, remote</access>
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<affected>
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<package name="app-misc/screen" auto="yes" arch="*">
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<unaffected range="ge">4.8.0-r2</unaffected>
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<vulnerable range="lt">4.8.0-r2</vulnerable>
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</package>
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</affected>
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<background>
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<p>GNU Screen is a full-screen window manager that multiplexes a physical
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terminal between several processes, typically interactive shells.
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</p>
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</background>
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<description>
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<p>It was discovered that GNU screen did not properly handle certain UTF-8
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character sequences.
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</p>
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</description>
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<impact type="normal">
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<p>A remote attacker could entice a user to run a program where attacker
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controls the output inside a GNU screen session, possibly resulting in
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execution of arbitrary code with the privileges of the process or a
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Denial of Service condition.
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</p>
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</impact>
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<workaround>
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<p>This vulnerability can be mitigated by disabling UTF-8 processing in
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.screenrc.
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</p>
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</workaround>
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<resolution>
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<p>All GNU screen users should upgrade to the latest version:</p>
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<code>
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# emerge --sync
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# emerge --ask --oneshot --verbose ">=app-misc/screen-4.8.0-r2"
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</code>
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</resolution>
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<references>
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<uri link="https://nvd.nist.gov/vuln/detail/CVE-2021-26937">CVE-2021-26937</uri>
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</references>
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<metadata tag="requester" timestamp="2021-05-25T21:07:51Z">whissi</metadata>
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<metadata tag="submitter" timestamp="2021-05-26T08:14:58Z">whissi</metadata>
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</glsa>
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