PHP up to 7.1.26/7.2.15/7.3.2 File Permission rename access control

Summaryinfo

A vulnerability, which was classified as critical, has been found in PHP up to 7.1.26/7.2.15/7.3.2. This issue affects the function rename of the component File Permission. The manipulation leads to access control. This vulnerability is documented as CVE-2019-9637. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in PHP up to 7.1.26/7.2.15/7.3.2 (Programming Language Software) and classified as critical. This issue affects the function rename of the component File Permission. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in PHP before 7.1.27, 7.2.x before 7.2.16, and 7.3.x before 7.3.3. Due to the way rename() across filesystems is implemented, it is possible that file being renamed is briefly available with wrong permissions while the rename is ongoing, thus enabling unauthorized users to access the data.

The bug was discovered 03/12/2019. The weakness was released 03/09/2019 (Website). It is possible to read the advisory at debian.org. The identification of this vulnerability is CVE-2019-9637 since 03/08/2019. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 197405 (Ubuntu Security Notification for Php7.0, Php7.2 Vulnerabilities (USN-3922-1)).

Upgrading to version 7.1.27, 7.2.16 or 7.3.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 108177†). Entries connected to this vulnerability are available at VDB-131532, VDB-131533, VDB-131534 and VDB-131535. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• PHP

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 7.1.9
• 7.1.10
• 7.1.11
• 7.1.12
• 7.1.13
• 7.1.14
• 7.1.15
• 7.1.16
• 7.1.17
• 7.1.18
• 7.1.19
• 7.1.20
• 7.1.21
• 7.1.22
• 7.1.23
• 7.1.24
• 7.1.25
• 7.1.26
• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 7.2.10
• 7.2.11
• 7.2.12
• 7.2.13
• 7.2.14
• 7.2.15
• 7.3.0
• 7.3.1
• 7.3.2

License

• open-source

Website

• Product: https://www.php.org/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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