CVE-2018-6345

Description

The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).

Weakness classification

• CWE-122: Heap-based Buffer Overflow
• CWE-787: Out-of-bounds Write

Primary references

• cve-assign@fb.com — Patch, Third Party Advisory
• cve-assign@fb.com — Release Notes, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory