CVE-2019-11044

link() silently truncates after a null byte on Windows

In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0 on Windows, PHP link() function accepts filenames with embedded \0 byte and treats them as terminating at that byte. This could lead to security vulnerabilities, e.g. in applications checking paths that the code is allowed to access.

Affected

PHP Group · PHP

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 PHP

3.7 LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N

EPSS

5.12% chance of exploitation in the next 30 days, 92nd percentile

Published

2019-12-23

Updated

2024-09-17

Proof-of-concept exploits (1)

• https://bugs.php.net/bug.php?id=78862

Security advisories

• https://security.netapp.com/advisory/ntap-20200103-0002
• https://www.tenable.com/security/tns-2021-14

References

• CVE Record
• NVD entry