It was discovered that there was a remote denial of service (DoS) vulnerability in memcached, a high-performance memory object caching system.

The try_read_command function allowed remote attackers to cause a DoS via a request to add/set a key that makes a comparison between a signed and unsigned integer which triggered a heap-based buffer over-read.

This vulnerability existed due to an incomplete upstream fix for CVE-2016-8705.

For Debian 7 'Wheezy', this issue has been fixed in memcached version 1.4.13-0.2+deb7u3.

We recommend that you upgrade your memcached packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in memcached, a high-performance memory object caching system. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2017-9951     Daniel Shapira reported a heap-based buffer over-read in     memcached (resulting from an incomplete fix for     CVE-2016-8705 ) triggered by specially crafted requests     to add/set a key and allowing a remote attacker to cause     a denial of service.

  - CVE-2018-1000115     It was reported that memcached listens to UDP by     default. A remote attacker can take advantage of it to     use the memcached service as a DDoS amplifier.

  Default installations of memcached in Debian are not affected by   this issue as the installation defaults to listen only on localhost.
  This update disables the UDP port by default. Listening on the UDP   can be re-enabled in the /etc/memcached.conf (cf.
  /usr/share/doc/memcached/NEWS.Debian.gz).

  - CVE-2018-1000127     An integer overflow was reported in memcached, resulting     in resource leaks, data corruption, deadlocks or     crashes.

According to the versions of the memcached package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - Memcached version 1.5.5 contains an Insufficient     Control of Network Message Volume (Network     Amplification, CWE-406) vulnerability in the UDP     support of the memcached server that can result in     denial of service via network flood (traffic     amplification of 1:50,000 has been reported by reliable     sources). This attack appear to be exploitable via     network connectivity to port 11211 UDP. This     vulnerability appears to have been fixed in 1.5.6 due     to the disabling of the UDP protocol by     default.(CVE-2018-1000115)

  - The try_read_command function in memcached.c in     memcached before 1.4.39 allows remote attackers to     cause 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. NOTE: this vulnerability     exists because of an incomplete fix for     CVE-2016-8705.(CVE-2017-9951)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - memcached: Integer Overflow in items.c:item_free() (CVE-2018-1000127)

  - The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause 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. NOTE: this vulnerability exists     because of an incomplete fix for CVE-2016-8705. (CVE-2017-9951)

  - Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification,     CWE-406) vulnerability in the UDP support of the memcached server that can result in denial of service via     network flood (traffic amplification of 1:50,000 has been reported by reliable sources). This attack     appear to be exploitable via network connectivity to port 11211 UDP. This vulnerability appears to have     been fixed in 1.5.6 due to the disabling of the UDP protocol by default. (CVE-2018-1000115)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

According to the versions of the memcached package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Memcached version 1.5.5 contains an Insufficient     Control of Network Message Volume (Network     Amplification, CWE-406) vulnerability in the UDP     support of the memcached server that can result in     denial of service via network flood (traffic     amplification of 1:50,000 has been reported by reliable     sources). This attack appear to be exploitable via     network connectivity to port 11211 UDP. This     vulnerability appears to have been fixed in 1.5.6 due     to the disabling of the UDP protocol by     default.(CVE-2018-1000115)

  - The try_read_command function in memcached.c in     memcached before 1.4.39 allows remote attackers to     cause 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. NOTE: this vulnerability     exists because of an incomplete fix for     CVE-2016-8705.(CVE-2017-9951)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for memcached fixes the following issues :

  - CVE-2017-9951: Fixed heap-based buffer over-read in     try_read_command function which allowed remote attackers     to cause a denial of service attack (bsc#1056865).

This update was imported from the SUSE:SLE-12:Update update project.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

This update for memcached fixes the following issues :

  - CVE-2017-9951: Fixed heap-based buffer over-read in     try_read_command function which allowed remote attackers     to cause a denial of service attack (bsc#1056865).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the memcached package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The try_read_command function in memcached.c in     memcached before 1.4.39 allows remote attackers to     cause 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. NOTE: this vulnerability     exists because of an incomplete fix for     CVE-2016-8705.(CVE-2017-9951)

  - Memcached version 1.5.5 contains an Insufficient     Control of Network Message Volume (Network     Amplification, CWE-406) vulnerability in the UDP     support of the memcached server that can result in     denial of service via network flood (traffic     amplification of 1:50,000 has been reported by reliable     sources). This attack appear to be exploitable via     network connectivity to port 11211 UDP. This     vulnerability appears to have been fixed in 1.5.6 due     to the disabling of the UDP protocol by     default.(CVE-2018-1000115)

  - memcached version prior to 1.4.37 contains an Integer     Overflow vulnerability in items.c:item_free() that can     result in data corruption and deadlocks due to items     existing in hash table being reused from free list.
    This attack appear to be exploitable via network     connectivity to the memcached service. This     vulnerability appears to have been fixed in 1.4.37 and     later.(CVE-2018-1000127)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the memcached packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - The try_read_command function in memcached.c in     memcached before 1.4.39 allows remote attackers to     cause 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. NOTE: this vulnerability     exists because of an incomplete fix for     CVE-2016-8705.(CVE-2017-9951)

  - Memcached version 1.5.5 contains an Insufficient     Control of Network Message Volume (Network     Amplification, CWE-406) vulnerability in the UDP     support of the memcached server that can result in     denial of service via network flood (traffic     amplification of 1:50,000 has been reported by reliable     sources). This attack appear to be exploitable via     network connectivity to port 11211 UDP. This     vulnerability appears to have been fixed in 1.5.6 due     to the disabling of the UDP protocol by     default.(CVE-2018-1000115)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - memcached: Integer Overflow in items.c:item_free() (CVE-2018-1000127)

  - Multiple integer signedness errors in the (1) process_bin_sasl_auth, (2) process_bin_complete_sasl_auth,     (3) process_bin_update, and (4) process_bin_append_prepend functions in Memcached 1.4.5 and earlier allow     remote attackers to cause a denial of service (crash) via a large body length value in a packet.
    (CVE-2011-4971)

  - The process_bin_delete function in memcached.c in memcached 1.4.4 and other versions before 1.4.17, when     running in verbose mode, allows remote attackers to cause a denial of service (segmentation fault) via a     request to delete a key, which does not account for the lack of a null terminator in the key and triggers     a buffer over-read when printing to stderr. (CVE-2013-0179)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3588-1 advisory.

    Daniel Shapira discovered an integer overflow issue in Memcached. A remote attacker could use this to     cause a denial of service (daemon crash). (CVE-2017-9951)

    It was discovered that Memcached listened to UDP by default. A remote attacker could use this as part of a     distributed denial of service attack. (CVE-2018-1000115)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
101856	Debian DLA-1033-1 : memcached security update	Nessus	Debian Local Security Checks	7/21/2017	1/11/2021	high
110386	Debian DSA-4218-1 : memcached - security update	Nessus	Debian Local Security Checks	6/7/2018	9/24/2024	high
138003	EulerOS Virtualization 3.0.6.0 : memcached (EulerOS-SA-2020-1784)	Nessus	Huawei Local Security Checks	7/1/2020	3/5/2024	high
199970	RHEL 7 : memcached (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	high
130675	EulerOS 2.0 SP5 : memcached (EulerOS-SA-2019-2213)	Nessus	Huawei Local Security Checks	11/8/2019	4/15/2024	high
108782	openSUSE Security Update : memcached (openSUSE-2018-327)	Nessus	SuSE Local Security Checks	4/2/2018	11/21/2024	high
195370	RHEL 6 : memcached (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	high
195371	RHEL 7 : memcached (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	high
108746	SUSE SLES12 Security Update : memcached (SUSE-SU-2018:0839-1)	Nessus	SuSE Local Security Checks	3/30/2018	11/22/2024	high
131883	EulerOS 2.0 SP2 : memcached (EulerOS-SA-2019-2391)	Nessus	Huawei Local Security Checks	12/10/2019	4/4/2024	high
132166	EulerOS 2.0 SP3 : memcached (EulerOS-SA-2019-2631)	Nessus	Huawei Local Security Checks	12/18/2019	4/3/2024	high
141706	EulerOS Virtualization 3.0.2.2 : memcached (EulerOS-SA-2020-2208)	Nessus	Huawei Local Security Checks	10/21/2020	9/7/2021	high
199949	RHEL 6 : memcached (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	high
107148	Ubuntu 14.04 LTS / 16.04 LTS : Memcached vulnerabilities (USN-3588-1)	Nessus	Ubuntu Local Security Checks	3/6/2018	8/27/2024	high

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