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CVE-2020-1917

Published: 10 March 2021

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.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
hhvm
Launchpad, Ubuntu, Debian
impish Does not exist

bionic Needs triage

focal Does not exist

xenial Needs triage

jammy Does not exist

kinetic Does not exist

groovy Does not exist

hirsute Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

mantic Does not exist

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H