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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 base score: 9.8

Status

Package Release Status
php5
Launchpad, Ubuntu, Debian
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

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

precise Ignored
(end of ESM support, was deferred)
trusty Needs triage

upstream Not vulnerable

xenial Does not exist

yakkety Does not exist

zesty Does not exist

php7.0
Launchpad, Ubuntu, Debian
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

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

precise Does not exist

trusty Does not exist

upstream Needed

xenial
Released (7.0.33-0ubuntu0.16.04.16+esm3)
yakkety Ignored
(reached end-of-life)
zesty Ignored
(reached end-of-life)
Patches:
upstream: https://github.com/php/php-src/commit/0b7dffb41f0b571c00304c973f9b85ef910d43d9
php7.2
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (7.2.24-0ubuntu0.18.04.11)
cosmic Ignored
(reached end-of-life)
disco Ignored
(reached end-of-life)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

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

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

jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

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

focal Does not exist

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

kinetic Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

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

focal Does not exist

impish Does not exist

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

upstream Needs triage

xenial Does not exist