Vulnerability CVE-2017-8923

Vulnerability Name:

CVE-2017-8923 (CCN-125935)

Assigned:

2017-05-12

Published:

2017-05-12

Updated:

2022-07-20

Summary:

The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.

CVSS v3 Severity:

9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.6 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:U/RC:R)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

CVSS v2 Severity:

7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

Vulnerability Type:

CWE-787

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2017-8923

Source: BID
Type: Third Party Advisory, VDB Entry
98518

Source: CCN
Type: BID-98518
PHP 'zend_string_extend()' Function Denial of Service Vulnerability

Source: CCN
Type: PHP Bug #74577
Memory corruption in zend_string_extend

Source: MISC
Type: Exploit, Issue Tracking, Vendor Advisory
https://bugs.php.net/bug.php?id=74577

Source: XF
Type: UNKNOWN
php-cve20178923-dos(125935)

Vulnerable Configuration:

Configuration 1:

cpe:/a:php:php:*:*:*:*:*:*:*:* (Version >= 8.0.0 and < 8.0.11)

OR cpe:/a:php:php:*:*:*:*:*:*:*:* (Version < 7.4.24)

Configuration CCN 1:

cpe:/a:php:php:7.1.5:-:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:1535	P	Security update for php7 (Moderate)	2022-03-03
oval:org.opensuse.security:def:1722	P	Security update for php7 (Moderate)	2022-03-03
oval:org.opensuse.security:def:102099	P	Security update for php7 (Moderate)	2022-03-03
oval:org.opensuse.security:def:102280	P	Security update for php7 (Moderate)	2022-03-03
oval:org.opensuse.security:def:5353	P	Security update for php72 (Moderate)	2022-02-25
oval:org.opensuse.security:def:5349	P	Security update for php74 (Moderate)	2022-02-21
oval:com.ubuntu.xenial:def:201789230000000	V	CVE-2017-8923 on Ubuntu 16.04 LTS (xenial) - low.	2017-05-12
oval:com.ubuntu.artful:def:20178923000	V	CVE-2017-8923 on Ubuntu 17.10 (artful) - low.	2017-05-12
oval:com.ubuntu.xenial:def:20178923000	V	CVE-2017-8923 on Ubuntu 16.04 LTS (xenial) - low.	2017-05-12
oval:com.ubuntu.disco:def:201789230000000	V	CVE-2017-8923 on Ubuntu 19.04 (disco) - low.	2017-05-12
oval:com.ubuntu.bionic:def:20178923000	V	CVE-2017-8923 on Ubuntu 18.04 LTS (bionic) - low.	2017-05-12
oval:com.ubuntu.cosmic:def:201789230000000	V	CVE-2017-8923 on Ubuntu 18.10 (cosmic) - low.	2017-05-12
oval:com.ubuntu.cosmic:def:20178923000	V	CVE-2017-8923 on Ubuntu 18.10 (cosmic) - low.	2017-05-12
oval:com.ubuntu.bionic:def:201789230000000	V	CVE-2017-8923 on Ubuntu 18.04 LTS (bionic) - low.	2017-05-12
oval:com.ubuntu.trusty:def:20178923000	V	CVE-2017-8923 on Ubuntu 14.04 LTS (trusty) - low.	2017-05-12

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