| Name | CVE-2021-21707 |
| Description | In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3243-1, DSA-5082-1, ELA-775-1, ELA-777-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| php5 (PTS) | jessie, jessie (lts) | 5.6.40+dfsg-0+deb8u18 | fixed |
| php7.0 (PTS) | stretch (security) | 7.0.33-0+deb9u12 | vulnerable |
| stretch (lts), stretch | 7.0.33-0+deb9u16 | fixed | |
| php7.3 (PTS) | buster | 7.3.31-1~deb10u1 | vulnerable |
| 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 |
|---|---|---|---|---|---|---|
| php5 | source | jessie | 5.6.40+dfsg-0+deb8u16 | ELA-777-1 | ||
| php5 | source | (unstable) | (unfixed) | |||
| php7.0 | source | stretch | 7.0.33-0+deb9u13 | ELA-775-1 | ||
| php7.0 | source | (unstable) | (unfixed) | |||
| php7.3 | source | buster | 7.3.31-1~deb10u2 | DLA-3243-1 | ||
| php7.3 | source | (unstable) | (unfixed) | |||
| php7.4 | source | bullseye | 7.4.28-1+deb11u1 | DSA-5082-1 | ||
| php7.4 | source | (unstable) | 7.4.26-1 | |||
| php8.0 | source | (unstable) | (unfixed) | |||
| php8.1 | source | (unstable) | 8.1.0-1 |
[stretch] - php7.0 <no-dsa> (Minor issue, fix along with next DLA)
Fixed in 8.1.0, 8.0.13, 7.4.26, 7.3.33
PHP Bug: https://bugs.php.net/79971
https://github.com/php/php-src/commit/f15f8fc573eb38c3c73e23e0930063a6f6409ed4