#VU11318 Buffer access with incorrect length value in memcached - CVE-2011-4971

Vulnerability identifier: #VU11318

Vulnerability risk: Medium

CVSSv4.0: 8.7 [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:A/U:Green]

CVE-ID: CVE-2011-4971

CWE-ID: CWE-805

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
memcached
Server applications / Web servers

Vendor: Memcached

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

The weakness exists in the (1) process_bin_sasl_auth, (2) process_bin_complete_sasl_auth, (3) process_bin_update, and (4) process_bin_append_prepend functions due to a large body length value in a packet. A remote attacker can trigger memory corruption and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

memcached: 1.4.0 - 1.4.5

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External links
https://code.google.com/archive/p/memcached/issues/192

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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, a fully functional exploit for this vulnerability is available.