Multiple vulnerabilities in PHP

1) Heap use-after-free error

EUVDB-ID: #VU8137

Risk: Medium

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-12932

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to improper use of the hash API for key deletion in a situation with an invalid array size. A remote attacker can use untrusted data to trigger heap use-after-free error in ext/standard/var_unserializer.re and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

The vulnerability is addressed in the following versions: 7.0.23, 7.1.9 and 7.2.0.

Vulnerable software versions

PHP: 7.0.0 - 7.1.8

CPE2.3

• cpe:2.3:a:php_group:php:7.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.9:*:*:*:*:*:*:*

External links

https://bugs.php.net/bug.php?id=74103

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Deserialization of untrusted data

EUVDB-ID: #VU8488

Risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of the user-input within unserialize () function. A remote attacker with ability to control input data can trigger denial of service (DoS) attack.

Mitigation

Update to version 7.0.23 or 7.1.9.

Vulnerable software versions

PHP: 7.0.0 - 7.1.8

CPE2.3

• cpe:2.3:a:php_group:php:7.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:7.0.10:*:*:*:*:*:*:*

External links

https://bugs.php.net/bug.php?id=75054

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.