| Name | CVE-2017-8923 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 881538, 881539 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| php7.0 (PTS) | stretch (security) | 7.0.33-0+deb9u12 | vulnerable |
| stretch (lts), stretch | 7.0.33-0+deb9u20 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| php7.0 | source | (unstable) | (unfixed) | | | 881538 |
| php7.1 | source | (unstable) | (unfixed) | | | 881539 |
Notes
[stretch] - php7.0 <ignored> (Minor issue)
PHP Bug: https://bugs.php.net/bug.php?id=74577
(Duplicate of) PHP Bug: https://bugs.php.net/bug.php?id=73122