Ubuntu update for Memcached

1) NULL pointer dereference

EUVDB-ID: #VU18374

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2019-11596

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dreference error in the "lru mode" and "lru temp_ttl" commands when parsing specially crafted lru command messages passed passed to process_lru_command() function in memcached.c. A remote attacker can send a specially crafted HTTP request to the affected application and perform denial of service (DoS) attack.

Exploitation example:

echo -n "bHJ1IG1vZGUKb7G0AGxydWRl6gdtTk9UXw==" | base64 -d | nc 127.0.0.1 11211

Mitigation

Update the affected packages.

Ubuntu 19.04

memcached - 1.5.10-0ubuntu1.19.04.1

Ubuntu 18.10

memcached - 1.5.10-0ubuntu1.18.10.1

Ubuntu 18.04 LTS

memcached - 1.5.6-0ubuntu1.1

Vulnerable software versions

memcached (Ubuntu package): 1.1.9-1 - 1.5.10-0ubuntu1

CPE2.3

• cpe:2.3:a:canonical:memcached_ubuntu_package:1.1.9-1:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:memcached_ubuntu_package:1.1.10-1:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:memcached_ubuntu_package:1.1.11-1:*:*:*:*:ubuntu:*:*

External links

https://usn.ubuntu.com/3963-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.