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