Assessment
Why it matters
EPSS is 5.1%; technical severity is CVSS 7.5.
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.
Who should care
- Teams operating Fedora, PHP, Security Center
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Fedora, PHP, Security Center is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Bugs Php Security patch
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CWE
- CWE-170
- Affected versions
- Fedoraproject Fedora (Version 30 | Version 31); PHP PHP (Start Including 7.2.0, End Including 7.2.26 | Start Including 7.3.0, End Including 7.3.13 | Version 7.4.0); Tenable Security Center (End Excluding 5.19.0)
- Fixed versions
- Tenable Security Center (Fixed from 5.19.0)
- Published
- 23 December 2019
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 5.1%
- Signal calculated at 15