HHVM up to 3.27.4/3.30 getextendedstats Hostname/Port out-of-bounds

Summaryinfo

A vulnerability marked as critical has been reported in HHVM up to 3.27.4/3.30. Affected by this vulnerability is the function Memcache::getextendedstats. Performing a manipulation as part of Hostname/Port results in out-of-bounds. This vulnerability is identified as CVE-2018-6340. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in HHVM up to 3.27.4/3.30. This affects the function Memcache::getextendedstats. The manipulation as part of a Hostname/Port leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The Memcache::getextendedstats function can be used to trigger an out-of-bounds read. Exploiting this issue requires control over memcached server hostnames and/or ports. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).

The bug was discovered 12/18/2018. The weakness was released 12/31/2018 (Website). The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2018-6340 since 01/26/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 13 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371667 (HHVM Out-Of-Bound Read Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-128600, VDB-128598 and VDB-128597. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• HHVM

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.27.0
• 3.27.1
• 3.27.2
• 3.27.3
• 3.27.4
• 3.28
• 3.29
• 3.30

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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