High severity · published Oct 26, 2021
CVE-2019-3556
HHVM supports the use of an "admin" server which accepts administrative requests over HTTP
8.1
CVSS
1.8%
EPSS
No
On KEV
Description
HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · 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
before 4.56.2; 4.57.0 through 4.78.0; 4.79.0; 4.80.0; 4.81.0; 4.82.0; +1 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-3556
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-3556
Patch
https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4
Vendor Advisory
https://hhvm.com/blog/2020/11/12/security-update.html
Broken Link
https://www.facebook.com/security/advisories/cve-2019-3556
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