cve-2021-21309
Vulnerability from cvelistv5
Published
2021-02-26 21:50
Modified
2024-08-03 18:09
Severity ?
5.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:L
EPSS score ?
0.46% (0.61472)
Summary
Redis is an open-source, in-memory database that persists on disk. In affected versions of Redis an integer overflow bug in 32-bit Redis version 4.0 or newer could be exploited to corrupt the heap and potentially result with remote code execution. Redis 4.0 or newer uses a configurable limit for the maximum supported bulk input size. By default, it is 512MB which is a safe value for all platforms. If the limit is significantly increased, receiving a large request from a client may trigger several integer overflow scenarios, which would result with buffer overflow and heap corruption. We believe this could in certain conditions be exploited for remote code execution. By default, authenticated Redis users have access to all configuration parameters and can therefore use the “CONFIG SET proto-max-bulk-len” to change the safe default, making the system vulnerable. **This problem only affects 32-bit Redis (on a 32-bit system, or as a 32-bit executable running on a 64-bit system).** The problem is fixed in version 6.2, and the fix is back ported to 6.0.11 and 5.0.11. Make sure you use one of these versions if you are running 32-bit Redis. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent clients from directly executing `CONFIG SET`: Using Redis 6.0 or newer, ACL configuration can be used to block the command. Using older versions, the `rename-command` configuration directive can be used to rename the command to a random string unknown to users, rendering it inaccessible. Please note that this workaround may have an additional impact on users or operational systems that expect `CONFIG SET` to behave in certain ways.
References
security-advisories@github.comhttps://github.com/redis/redis/commit/c992857618db99776917f10bf4f2345a5fdc78b0Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/redis/redis/pull/8522Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/redis/redis/security/advisories/GHSA-hgj8-vff2-7cjfThird Party Advisory
security-advisories@github.comhttps://security.gentoo.org/glsa/202103-02Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/redis/redis/commit/c992857618db99776917f10bf4f2345a5fdc78b0Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/redis/redis/pull/8522Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/redis/redis/security/advisories/GHSA-hgj8-vff2-7cjfThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202103-02Third Party Advisory
Impacted products
Vendor Product Version
redis redis Version: < 5.0.11
Version: >= 6.0.0, < 6.0.11
 Create a notification for this product.
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explotada para una ejecución de código remota.&#xa0;Por defecto,  usuarios de Redis autenticados poseen acceso a todos los parámetros de configuración y, por lo tanto, pueden usar \\\"CONFIG SET proto-max-bulk-len\\\" para cambiar el valor predeterminado seguro,&#xa0;haciendo que el sistema sea vulnerable.** Este problema solo afecta a Redis de 32 bits (en un sistema de 32 bits o como un ejecutable de 32 bits que se ejecuta en un sistema de 64 bits). ** El problema se corrigió en la versión 6.2 y la solución se ha modificado a versiones  6.0.11 y 5.0.11.&#xa0;Asegúrese de usar una de estas versiones si está ejecutando Redis de 32 bits.&#xa0;Una solución alternativa para mitigar el problema sin parchear el ejecutable de redis-server es impedir que los clientes ejecuten directamente `CONFIG SET`: Con Redis versiones 6.0 o más recientes, la configuración de ACL puede ser usada para bloquear el comando.&#xa0;Utilizando versiones anteriores, la directiva de configuración 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   },
}


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Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.