[arch-security] [ASA-201611-1] memcached: arbitrary code execution

[Remi Gacogne]

Arch Linux Security Advisory ASA-201611-1
=========================================

Severity: Critical
Date    : 2016-11-01
CVE-ID  : CVE-2016-8704 CVE-2016-8705 CVE-2016-8706
Package : memcached
Type    : arbitrary code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package memcached before version 1.4.32-1 is vulnerable to
arbitrary code execution.

Resolution
==========

Upgrade to 1.4.32-1.

# pacman -Syu "memcached>=1.4.32-1"

The problems have been fixed upstream in version 1.4.32.

Workaround
==========

If you do not use the binary protocol at all, a workaround is to start
memcached with "-B ascii" to disable it.

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

- CVE-2016-8704 (arbitrary code execution)

An integer overflow in the process_bin_append_prepend function which is
responsible for processing multiple commands of Memcached binary
protocol can be abused to cause heap overflow and lead to remote code
execution.

- CVE-2016-8705 (arbitrary code execution)

Multiple integer overflows in process_bin_update function which is
responsible for processing multiple commands of Memcached binary
protocol can be abused to cause heap overflow and lead to remote code
execution.

- CVE-2016-8706 (arbitrary code execution)

An integer overflow in process_bin_sasl_auth function which is
responsible for authentication commands of Memcached binary protocol
can be abused to cause heap overflow and lead to remote code execution.

Impact
======

A remote unauthenticated attacker can execute arbitrary code on the
affected host.

References
==========

http://www.talosintelligence.com/reports/TALOS-2016-0219/
http://www.talosintelligence.com/reports/TALOS-2016-0220/
http://www.talosintelligence.com/reports/TALOS-2016-0221/
http://blog.talosintel.com/2016/10/memcached-vulnerabilities.html
https://github.com/memcached/memcached/wiki/ReleaseNotes1433
https://access.redhat.com/security/cve/CVE-2016-8704
https://access.redhat.com/security/cve/CVE-2016-8705
https://access.redhat.com/security/cve/CVE-2016-8706

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