Multiple vulnerabilities in PHP

Published: 2017-09-01 | Updated: 2017-09-18

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-12932
CWE-ID	CWE-416 CWE-502
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software	PHP Universal components / Libraries / Scripting languages
Vendor	PHP Group

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

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

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.