CVE-2023-3823
Security issue with external entity loading in XML without enabling it
Description
In PHP versions 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 various XML functions rely on libxml global state to track configuration variables, like whether external entities are loaded. This state is assumed to be unchanged unless the user explicitly changes it by calling appropriate function. However, since the state is process-global, other modules - such as ImageMagick - may also use this library within the same process, and change that global state for their internal purposes, and leave it in a state where external entities loading is enabled. This can lead to the situation where external XML is parsed with external entities loaded, which can lead to disclosure of any local files accessible to PHP. This vulnerable state may persist in the same process across many requests, until the process is shut down.
How to fix CVE-2023-3823
To remediate CVE-2023-3823, upgrade the affected package to a fixed version below.
- —upgrade to 8.0.30 or later
- —upgrade to 8.0.30 or later
- —upgrade to 8.0.30 or later
Is CVE-2023-3823 being exploited?
Low — EPSS is 1.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- >= 8.0.0, < 8.0.30, >= 8.1.0, < 8.1.22, >= 8.2.0, < 8.2.9
- >= 8.0.0, < 8.0.30, >= 8.1.0, < 8.1.22, >= 8.2.0, < 8.2.9
- >= 8.0.0, < 8.0.30, >= 8.1.0, < 8.1.22, >= 8.2.0, < 8.2.9
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |