PT-2019-11020 · Facebook · Hhvm

Fred Emmott · Published 2019-01-15 · Updated 2020-09-21 · CVE-2018-6345

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: HHVM versions 3.30.1 and 3.27.5 and below

Description: The issue arises from the function number format when its second argument ($dec points) is excessively large, leading to a heap overflow. This occurs because the internal implementation of number format creates a string with an invalid length, which can then interact poorly with other functions.

Recommendations: For HHVM versions 3.30.1 and 3.27.5 and below, consider restricting the use of the number format function with large $dec points values until a patch is available. As a temporary workaround, limit the value of $dec points to prevent excessively large inputs. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-787

CWE-122

Related Identifiers

CVE-2018-6345

Affected Products

Hhvm

References · 8

• https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3 · Patch
• https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-6345 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-6345 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-6345 · Security Note
• https://osv.dev/vulnerability/CVE-2018-6345 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-6345 · Security Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6345 · Note