Description
In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| HHVM | 4.98.0, 4.97.0, 4.96.0, 4.95.0, 4.94.0, 4.81.0 – < unspecified, 4.57.0 – < unspecified, unspecified – < 4.56.3 | unspecified |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | hhvm | No fix yet | — |
| Ubuntu 16.04 LTS | hhvm | No fix yet | — |