CVE-2018-6340 Information disclosure in HHVM

What is CVE-2018-6340?

CVE-2018-6340 is a high-severity vulnerability in Facebook HHVM, published on 31 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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).

Weakness: CWE-125

Which versions are affected by CVE-2018-6340?

It affects 1 product.

Products include Facebook Hhvm.

How do I fix CVE-2018-6340?

No fix has been published for CVE-2018-6340 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-6340 being exploited?

There is no known exploitation of CVE-2018-6340 in the wild and no public exploit code.

Other vulnerabilities in Facebook HHVM

• CVE-2022-36937 HHVM 4.172.0 and all prior versions use TLS 1.0 for secure connections when handling tls:// URLs in the stream extension. Critical 9.8
• CVE-2020-1900 Use after free in HHVM Critical 9.8
• CVE-2020-1916 Integer overflow in HHVM Critical 9.8
• CVE-2020-1917 Memory corruption in HHVM Critical 9.8
• CVE-2021-24025 Integer overflow in HHVM Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q37v-wf54-qchq, UBUNTU-CVE-2018-6340.