CVE-2019-12529
Estado: ModificadaMedia (5.9)—
An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Puntuación base: 5.9
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 8.09%
- Percentil entre todas las CVEs puntuadas: 95
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (5)
CWE
- CWE-125
Referencias
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html
- http://www.squid-cache.org/Versions/v4/changesets/
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patch
- https://github.com/squid-cache/squid/commits/v4
- https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
- https://seclists.org/bugtraq/2019/Aug/42
- https://usn.ubuntu.com/4065-1/
- https://usn.ubuntu.com/4065-2/
- https://www.debian.org/security/2019/dsa-4507
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html
- http://www.squid-cache.org/Versions/v4/changesets/
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patch
- https://github.com/squid-cache/squid/commits/v4
- https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
- https://seclists.org/bugtraq/2019/Aug/42
- https://usn.ubuntu.com/4065-1/
- https://usn.ubuntu.com/4065-2/
- https://www.debian.org/security/2019/dsa-4507
JSON original (NVD)
Mostrar
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"value": "An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages."
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"value": "Se detectó un problema en Squid versiones 2.x hasta 2.7.STABLE9, versiones 3.x hasta 3.5.28 y versiones 4.x hasta 4.7. Cuando Squid se configura para utilizar la autenticación básica, el encabezado Proxy-Authorization se analiza por medio de uudecode. uudecode determina cuántos bytes se descodificarán mediante la iteración sobre la entrada y comprobando su tabla. A continuación, la longitud se utiliza para empezar a decodificar la cadena. No hay comprobaciones para asegurarse de que la longitud que calcula no es mayor que el búfer de entrada. Esto conlleva a que la memoria adyacente esta siendo decodificada también. Un atacante no podría recuperar los datos descodificados a menos que el mantenedor de Squid haya configurado la visualización de nombres de usuario en las páginas de error."
}
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"lastModified": "2026-06-17T02:14:50.113",
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