Critical severity · published Jan 15, 2019
CVE-2018-6345
The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large
9.8
CVSS
1.7%
EPSS
No
On KEV
Description
The function number_format is vulnerable to a heap overflow issue when its second argument ($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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HH
HHVM · Facebook
3.30.2; 3.30.0 before unspecified; 3.27.6; before 3.27.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-6345
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-6345
Patch
https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3
Release Notes
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html
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