ubuntu-cve-2023-3823
Vulnerability from osv_ubuntu
Published
2023-08-11 06:15
Modified
2026-04-22 07:45
Summary
Details
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.
Severity
8.6 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
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"versions": [
"8.1.0~rc4-1ubuntu2",
"8.1.0-1",
"8.1.2-1ubuntu1",
"8.1.2-1ubuntu2",
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"8.1.2-1ubuntu2.3",
"8.1.2-1ubuntu2.4",
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}
],
"aliases": [],
"details": "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\u00a0ImageMagick - 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.",
"id": "UBUNTU-CVE-2023-3823",
"modified": "2026-04-22T07:45:03Z",
"published": "2023-08-11T06:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-3823"
},
{
"type": "REPORT",
"url": "https://github.com/php/php-src/security/advisories/GHSA-3qrf-m4j2-pcrr"
},
{
"type": "REPORT",
"url": "https://github.com/php/php-src/commit/c283c3ab0ba45d21b2b8745c1f9c7cbfe771c975"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6305-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6305-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6305-3"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3823"
}
],
"related": [
"USN-6305-1",
"USN-6305-2",
"USN-6305-3"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-3823"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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