CVE-2019-3556 is a vulnerability in Facebook Hhvm
Published on October 26, 2021
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.
Weakness Type
What is a Directory traversal Vulnerability?
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2019-3556 has been classified to as a Directory traversal vulnerability or weakness.
Products Associated with CVE-2019-3556
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Affected Versions
Facebook HHVM:- Version 4.83.1 and below unspecified is unaffected.
- Version 4.83.0 and below unspecified is affected.
- Version 4.82.1 and below unspecified is unaffected.
- Version 4.82.0 and below unspecified is affected.
- Version 4.81.1 and below unspecified is unaffected.
- Version 4.81.0 and below unspecified is affected.
- Version 4.80.1 and below unspecified is unaffected.
- Version 4.80.0 and below unspecified is affected.
- Version 4.79.1 and below unspecified is unaffected.
- Version 4.79.0 and below unspecified is affected.
- Version 4.78.1 and below unspecified is unaffected.
- Version 4.57.0 and below unspecified is affected.
- Version 4.56.2 and below unspecified is unaffected.
- Version unspecified and below 4.56.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.