var-202011-0763
Vulnerability from variot

In tmux before version 3.1c the function input_csi_dispatch_sgr_colon() in file input.c contained a stack-based buffer-overflow that can be exploited by terminal output. tmux Is vulnerable to an out-of-bounds write.Information is obtained, information is tampered with, and service is disrupted (DoS) It may be put into a state. ========================================================================= Ubuntu Security Notice USN-4618-1 November 05, 2020

tmux vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.10
  • Ubuntu 20.04 LTS

Summary:

tmux could be made to crash or execute arbitrary code if it received a specially crafted input.

Software Description: - tmux: terminal multiplexer

Details:

Sergey Nizovtsev discovered that tmux incorrectly handled some inputs.

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10: tmux 3.1b-1ubuntu0.1

Ubuntu 20.04 LTS: tmux 3.0a-2ubuntu0.2

After a standard system update you need to restart tmux session to make all the necessary changes.

References: https://usn.ubuntu.com/4618-1 CVE-2020-27347

Package Information: https://launchpad.net/ubuntu/+source/tmux/3.1b-1ubuntu0.1 https://launchpad.net/ubuntu/+source/tmux/3.0a-2ubuntu0.2 . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202011-10

                                       https://security.gentoo.org/

Severity: Normal Title: tmux: Buffer overflow Date: November 11, 2020 Bugs: #753206 ID: 202011-10

Synopsis

A buffer overflow in tmux might allow remote attacker(s) to execute arbitrary code.

Background

tmux is a terminal multiplexer.

Affected packages

-------------------------------------------------------------------
 Package              /     Vulnerable     /            Unaffected
-------------------------------------------------------------------

1 app-misc/tmux < 3.1c >= 3.1c

Description

A flaw in tmux's handling of escape characters was discovered which may allow a buffer overflow.

Impact

A remote attacker could possibly execute arbitrary code with the privileges of the process, or cause a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All tmux users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose ">=app-misc/tmux-3.1c"

References

[ 1 ] CVE-2020-27347 https://nvd.nist.gov/vuln/detail/CVE-2020-27347

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

https://security.gentoo.org/glsa/202011-10

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.

License

Copyright 2020 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5

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