SB2018060712 - Debian update for memcached

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Buffer over-read (CVE-ID: CVE-2017-9951)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the try_read_command function in memcached.c in memcached before 1.4.39. A remote attacker can perform a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read.

The vulnerability is dubbed Twistlock.

2) Network amplification (CVE-ID: CVE-2018-1000115)

The vulnerability allows a remote unauthenticated attacker to conduct DDoS amplification attack against the target system.

The weakness exists due to insufficient control of network message volume. A remote attacker can scan for affected, insecure Memcached servers via UDP port 11211,spoof UDP packets, send a specially crafted request, trigger a response and conduct DDoS amplification attack.

3) Integer overflow (CVE-ID: CVE-2018-1000127)

The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the items.c:item_free() function due to improper bounds checks. A remote attacker can trigger integer overflow and cause the service to crash.

4) Heap-based buffer overflow (CVE-ID: CVE-2016-8705)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists in the process_bin_update() function due to integer overflow. A remote attacker can send specially crafted Memcached binary protocol commands, trigger heap-based buffer overflow and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Remediation

Install update from vendor's website.

References

• https://www.debian.org/security/2018/dsa-4218