ubuntu-cve-2021-21706
Vulnerability from osv_ubuntu
Published
2021-10-04 04:15
Modified
2025-07-16 04:56
Summary
Details
In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions.
Severity
6.5 (Medium)
5.3 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libapache2-mod-php8.1",
"binary_version": "8.1.0-1"
},
{
"binary_name": "libapache2-mod-php8.1-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "libphp8.1-embed",
"binary_version": "8.1.0-1"
},
{
"binary_name": "libphp8.1-embed-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-bcmath",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-bcmath-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-bz2",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-bz2-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-cgi",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-cgi-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-cli",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-cli-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-common",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-common-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-curl",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-curl-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-dba",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-dba-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-dev",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-enchant",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-enchant-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-fpm",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-fpm-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-gd",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-gd-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-gmp",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-gmp-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-imap",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-imap-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-interbase",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-interbase-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-intl",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-intl-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-ldap",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-ldap-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-mbstring",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-mbstring-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-mysql",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-mysql-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-odbc",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-odbc-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-opcache",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-opcache-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-pgsql",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-pgsql-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-phpdbg",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-phpdbg-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-pspell",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-pspell-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-readline",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-readline-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-snmp",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-snmp-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-soap",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-soap-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-sqlite3",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-sqlite3-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-sybase",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-sybase-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-tidy",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-tidy-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-xml",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-xml-dbgsym",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-xsl",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-zip",
"binary_version": "8.1.0-1"
},
{
"binary_name": "php8.1-zip-dbgsym",
"binary_version": "8.1.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "php8.1",
"purl": "pkg:deb/ubuntu/php8.1@8.1.0-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8.1.0-1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.1.0~rc4-1ubuntu2"
]
}
],
"aliases": [],
"details": "In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions.",
"id": "UBUNTU-CVE-2021-21706",
"modified": "2025-07-16T04:56:59Z",
"published": "2021-10-04T04:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-21706"
},
{
"type": "REPORT",
"url": "https://bugs.php.net/bug.php?id=81420"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-21706"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "negligible",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-21706"
],
"withdrawn": "2025-07-18T16:46:38Z"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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