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CVE-2017-8923

Published: 12 May 2017

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.

Notes

AuthorNote
leosilva
unfixed upstream as of 2020-06-23
rodrigo-zaiden
php7.0 retriage on 2022-02-01 found that upstream fixed it on
2021-08-18, information is now updated to reflect this.

Priority

Low

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
php5
Launchpad, Ubuntu, Debian
impish Does not exist

hirsute Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Needed

upstream Not vulnerable

xenial Does not exist

yakkety Does not exist

zesty Does not exist

mantic Does not exist

php7.2
Launchpad, Ubuntu, Debian
impish Does not exist

bionic
Released (7.2.24-0ubuntu0.18.04.11)
hirsute Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

artful Does not exist

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

php7.4
Launchpad, Ubuntu, Debian
bionic Does not exist

impish Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

focal
Released (7.4.3-4ubuntu2.10)
jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

php8.0
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

impish
Released (8.0.8-1ubuntu0.3)
trusty Does not exist

upstream Needs triage

xenial Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

php8.1
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

impish Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

jammy Not vulnerable
(8.1.0-1)
kinetic Not vulnerable
(8.1.0-1)
lunar Not vulnerable
(8.1.0-1)
mantic Does not exist

php7.0
Launchpad, Ubuntu, Debian
hirsute Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

impish Does not exist

trusty Does not exist

upstream Needed

xenial
Released (7.0.33-0ubuntu0.16.04.16+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)
mantic Does not exist

Patches:
upstream: https://github.com/php/php-src/commit/0b7dffb41f0b571c00304c973f9b85ef910d43d9

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H