| Name | CVE-2021-21708 |
| Description | In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5082-1 |
| Debian Bugs | 1006672 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| php7.3 (PTS) | buster | 7.3.31-1~deb10u1 | fixed |
| buster (security) | 7.3.31-1~deb10u5 | fixed | |
| php7.4 (PTS) | bullseye | 7.4.33-1+deb11u4 | fixed |
| bullseye (security) | 7.4.33-1+deb11u5 | fixed |
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) | (not affected) | |||
| php7.3 | source | (unstable) | (not affected) | |||
| php7.4 | source | bullseye | 7.4.28-1+deb11u1 | DSA-5082-1 | ||
| php7.4 | source | (unstable) | (unfixed) | |||
| php8.1 | source | (unstable) | 8.1.5-1 | 1006672 |
- php7.3 <not-affected> (Vulnerable code introduced in 7.4)
- php7.0 <not-affected> (Vulnerable code introduced in 7.4)
Fixed in 8.1.3, 7.4.28
PHP Bug: https://bugs.php.net/81708