When PHP EXIF extension is parsing EXIF information from an image, e.g. via exif_read_data() function, in PHP versions 7.1.x below 7.1.31, 7.2.x below 7.2.21 and 7.3.x below 7.3.8 it is possible to supply it with data what will cause it to read past the allocated buffer. This may lead to information disclosure or crash.
https://bugs.php.net/bug.php?id=78222
https://lists.debian.org/debian-lts-announce/2019/08/msg00010.html
https://usn.ubuntu.com/4097-2/
https://usn.ubuntu.com/4097-1/
https://security.netapp.com/advisory/ntap-20190822-0003/
https://seclists.org/bugtraq/2019/Sep/35
https://www.debian.org/security/2019/dsa-4527
https://seclists.org/bugtraq/2019/Sep/38
https://www.debian.org/security/2019/dsa-4529
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00019.html
https://support.apple.com/kb/HT210634
https://seclists.org/bugtraq/2019/Oct/9
http://seclists.org/fulldisclosure/2019/Oct/15
http://seclists.org/fulldisclosure/2019/Oct/55
Source: MITRE
Published: 2019-08-09
Updated: 2021-07-22
Type: CWE-125
Base Score: 5.8
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:P
Impact Score: 4.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 7.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Impact Score: 4.2
Exploitability Score: 2.8
Severity: HIGH