GHSA-754H-5R27-7X3R
Vulnerability from github – Published: 2020-09-02 17:29 – Updated: 2023-01-24 18:07
VLAI?
Summary
RCE in Symfony
Details
Description
The CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by CachingHttpClient and if an attacker can control the response for a request being made by the CachingHttpClient, remote code execution is possible.
Resolution
HTTP headers designed for internal use in HttpCache are now stripped from remote responses before being passed to HttpCache.
The patch for this issue is available here for the 4.4 branch.
Credits
I would like to thank Matthias Pigulla (webfactory GmbH) for reporting and fixing the issue.
Severity ?
8.0 (High)
{
"affected": [
{
"package": {
"ecosystem": "Packagist",
"name": "symfony/http-kernel"
},
"ranges": [
{
"events": [
{
"introduced": "4.3.0"
},
{
"fixed": "4.4.13"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Packagist",
"name": "symfony/http-kernel"
},
"ranges": [
{
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.1.5"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Packagist",
"name": "symfony/symfony"
},
"ranges": [
{
"events": [
{
"introduced": "4.3.0"
},
{
"fixed": "4.4.13"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Packagist",
"name": "symfony/symfony"
},
"ranges": [
{
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.1.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-15094"
],
"database_specific": {
"cwe_ids": [
"CWE-212"
],
"github_reviewed": true,
"github_reviewed_at": "2020-09-02T17:29:29Z",
"nvd_published_at": "2020-09-02T18:15:00Z",
"severity": "HIGH"
},
"details": "Description\n-----------\n\nThe `CachingHttpClient` class from the HttpClient Symfony component relies on the `HttpCache` class to handle requests. `HttpCache` uses internal headers like `X-Body-Eval` and `X-Body-File` to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by `CachingHttpClient` and if an attacker can control the response for a request being made by the `CachingHttpClient`, remote code execution is possible.\n\nResolution\n----------\n\nHTTP headers designed for internal use in `HttpCache` are now stripped from remote responses before being passed to `HttpCache`.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78) for the 4.4 branch.\n\nCredits\n-------\n\nI would like to thank Matthias Pigulla (webfactory GmbH) for reporting and fixing the issue.",
"id": "GHSA-754h-5r27-7x3r",
"modified": "2023-01-24T18:07:50Z",
"published": "2020-09-02T17:29:56Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/symfony/symfony/security/advisories/GHSA-754h-5r27-7x3r"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-15094"
},
{
"type": "WEB",
"url": "https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78"
},
{
"type": "WEB",
"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2020-15094.yaml"
},
{
"type": "WEB",
"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2020-15094.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/symfony/symfony"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HNGUWOEETOFVH4PN3I3YO4QZHQ4AUKF3"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VAQJXAKWPMWB7OL6QPG2ZSEQZYYPU5RC"
},
{
"type": "WEB",
"url": "https://packagist.org/packages/symfony/http-kernel"
},
{
"type": "WEB",
"url": "https://packagist.org/packages/symfony/symfony"
},
{
"type": "WEB",
"url": "https://symfony.com/cve-2020-15094"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "RCE in Symfony"
}
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Sightings
| Author | Source | Type | Date |
|---|
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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