by Kastro
Paper/Archive/CVE-2020-1917

CVE-2020-1917

Facebook HHVM — xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not us…

EPSS 1%CVSS 9.8
critical.is priorityof 100
44
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 72.2.722 × 2014.4No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. 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

ProductAffectedFixed inSource
HHVM4.98.04.98.1CNA
HHVM4.97.04.98.1CNA
HHVM4.96.04.98.1CNA
HHVM4.95.04.98.1CNA
HHVM4.94.04.98.1CNA
HHVM4.81.0 – < unspecifiedunspecifiedCNA
HHVM4.57.0 – < unspecifiedunspecifiedCNA
HHVMunspecified – < 4.56.34.56.3CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refhhvm.com/blog/2021/02/25/security-update.htmlrefgithub.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca