Denial of service in PHP



Published: 2017-05-15 | Updated: 2018-04-05
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2017-9119
CVE-2017-8923
CWE-ID CWE-400
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		PHP
Universal components / Libraries / Scripting languages

Vendor PHP Group

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU10338

Risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-9119

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to insufficient input validation in i_zval_ptr_dtor function in Zend/zend_variables.h when processing array data structures. A remote attacker can consume all available resources on the system and trigger application crash.

Mitigation

Update to version 5.6.31, 7.0.20 or 7.1.6.

Vulnerable software versions

PHP: 5.5.0 - 7.1.5

External links

http: 
http://bugs.php.net/bug.php?id=74593


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) Improper input validation

EUVDB-ID: #VU10335

Risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-8923

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient input validation in zend_string_extend() function in Zend/zend_string.h when leveraging a script's use of ".=" with a long. The application does not prevent changes to string objects that can result in a negative length. A remote attacker can pass an overly long string to script, which uses ".=" operand on the supplied data and trigger application crash.

Mitigation

Update to version 5.6.31, 7.0.20 or 7.1.6.

Vulnerable software versions

PHP: 5.5.0 - 7.1.5

External links

http://bugs.php.net/bug.php?id=74577
http://bugs.php.net/bug.php?id=73122


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.



###SIDEBAR###