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Gentoo Linux Security Advisory                           GLSA 202105-07
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: Telegram: Security bypass
      Date: May 26, 2021
      Bugs: #771684
        ID: 202105-07

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Synopsis
========

An insufficient session expiration has been reported in Telegram.

Background
==========

Telegram is a cloud-based mobile and desktop messaging app with a focus
on security and speed.

Affected packages
=================

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-im/telegram-desktop      < 2.4.11                  >= 2.4.11
   2  net-im/telegram-desktop-bin
                                   < 2.4.11                  >= 2.4.11
     -------------------------------------------------------------------
      2 affected packages

Description
===========

It was discovered that Telegram failed to invalidate a recently active
session.

Impact
======

Please review the referenced CVE identifiers for details.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Telegram users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=net-im/telegram-desktop-2.4.11"

All Telegram binary users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot -v ">=net-im/telegram-desktop-bin-2.4.11"

References
==========

[ 1 ] CVE-2021-27351
       https://nvd.nist.gov/vuln/detail/CVE-2021-27351

Availability
============

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

  https://security.gentoo.org/glsa/202105-07

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
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2021 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