CVE-2020-15811
squid: HTTP Request Splitting could result in cache poisoning
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.
Se detectó un problema en Squid versiones anteriores a 4.13 y versiones 5.x anteriores a 5.0.4. Debido a la comprobación de datos incorrecta, los ataques de División de Peticiones HTTP pueden tener éxito contra el tráfico HTTP y HTTPS. Esto conlleva al envenenamiento de la caché. Esto permite a cualquier cliente, incluyendo los scripts del navegador, omitir la seguridad local y envenenar la caché del navegador y cualquier caché aguas abajo con contenido de una fuente arbitraria. Squid usa una búsqueda de cadenas en lugar de analizar el encabezado Transfer-Encoding para encontrar codificación fragmentada. Esto permite a un atacante ocultar una segunda petición dentro de Transfer-Encoding: Squid la interpreta como fragmentada y dividida en una segunda petición entregada en sentido ascendente. Squid luego entregará dos respuestas distintas al cliente, corrompiendo cualquier caché aguas abajo
A flaw was found in squid. Due to incorrect data validation, an HTTP Request Splitting attack against HTTP and HTTPS traffic is possible leading to cache poisoning. The highest threat from this vulnerability is to data confidentiality and integrity.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-07-17 CVE Reserved
- 2020-08-27 CVE Published
- 2024-02-02 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
- CWE-697: Incorrect Comparison
CAPEC
References (15)
| URL | Tag | Source |
|---|---|---|
| https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html | Mailing List |
|
| https://security.netapp.com/advisory/ntap-20210219-0007 | Third Party Advisory |
|
| https://security.netapp.com/advisory/ntap-20210226-0006 | Third Party Advisory |
|
| https://security.netapp.com/advisory/ntap-20210226-0007 | Broken Link |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wv | 2024-02-02 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Squid-cache Search vendor "Squid-cache" | Squid Search vendor "Squid-cache" for product "Squid" | < 4.13 Search vendor "Squid-cache" for product "Squid" and version " < 4.13" | - |
Affected
| ||||||
| Squid-cache Search vendor "Squid-cache" | Squid Search vendor "Squid-cache" for product "Squid" | >= 5.0 < 5.0.4 Search vendor "Squid-cache" for product "Squid" and version " >= 5.0 < 5.0.4" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04" | lts |
Affected
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| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04" | lts |
Affected
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| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04" | lts |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 31 Search vendor "Fedoraproject" for product "Fedora" and version "31" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 32 Search vendor "Fedoraproject" for product "Fedora" and version "32" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
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| Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.1 Search vendor "Opensuse" for product "Leap" and version "15.1" | - |
Affected
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| Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.2 Search vendor "Opensuse" for product "Leap" and version "15.2" | - |
Affected
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