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Gentoo GLSA-202105-11 Normal: GNU Screen Remote Code Execution Risk

gentoo
Calendar Grey May 26, 2021
Dist Gentoo Esm H88
Security flaw in GNU Screen enables remote code execution. Implement updates to reduce vulnerabilities and bolster protection on Gentoo installations.
A vulnerability in GNU screen may allow a remote attacker to execute arbitrary code.

Summary

It was discovered that GNU screen did not properly handle certain UTF-8 character sequences.

Topics%20covered

Topics Covered

security advisory gentoo code execution remote execution arbitrary code Gentoo Linux normal user-assisted exploit GNU Screen

Resolution

All GNU screen users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-misc/screen-4.8.0-r2"

References

[ 1 ] CVE-2021-26937 https://nvd.nist.gov/vuln/detail/CVE-2021-26937

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202105-11
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: GNU Screen: User-assisted execution of arbitrary code
Date: May 26, 2021
Bugs: #769770
ID: 202105-11

Topics%20covered

Topics Covered

security advisory gentoo code execution remote execution arbitrary code Gentoo Linux normal user-assisted exploit GNU Screen

Synopsis

A vulnerability in GNU screen may allow a remote attacker to execute arbitrary code.

Background

GNU Screen is a full-screen window manager that multiplexes a physical terminal between several processes, typically interactive shells.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-misc/screen < 4.8.0-r2 >= 4.8.0-r2

Impact

===== A remote attacker could entice a user to run a program where attacker controls the output inside a GNU screen session, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

Workaround

This vulnerability can be mitigated by disabling UTF-8 processing in .screenrc.

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