Vulnerability Description
Redis is an open source, in-memory database that persists on disk. When parsing an incoming Redis Standard Protocol (RESP) request, Redis allocates memory according to user-specified values which determine the number of elements (in the multi-bulk header) and size of each element (in the bulk header). An attacker delivering specially crafted requests over multiple connections can cause the server to allocate significant amount of memory. Because the same parsing mechanism is used to handle authentication requests, this vulnerability can also be exploited by unauthenticated users. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways: Using network access control tools like firewalls, iptables, security groups, etc. or Enabling TLS and requiring users to authenticate using client side certificates.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redis | Redis | >= 5.0.0, < 5.0.14 |
| Fedoraproject | Fedora | 33 |
| Debian | Debian Linux | 10.0 |
| Netapp | Management Services For Element Software | - |
| Netapp | Management Services For Netapp Hci | - |
| Oracle | Communications Operations Monitor | 4.3 |
Related Weaknesses (CWE)
References
- https://github.com/redis/redis/commit/5674b0057ff2903d43eaff802017eddf37c360f8PatchThird Party Advisory
- https://github.com/redis/redis/security/advisories/GHSA-f6pw-v9gw-v64pThird Party Advisory
- https://lists.apache.org/thread.html/ra603ff6e04549d7f290f61f9b11e2d2e4dba693b05
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202209-17Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211104-0003/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5001Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatchThird Party Advisory
- https://github.com/redis/redis/commit/5674b0057ff2903d43eaff802017eddf37c360f8PatchThird Party Advisory
- https://github.com/redis/redis/security/advisories/GHSA-f6pw-v9gw-v64pThird Party Advisory
- https://lists.apache.org/thread.html/ra603ff6e04549d7f290f61f9b11e2d2e4dba693b05
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2021-32675?
CVE-2021-32675 is a vulnerability with a CVSS score of 7.5 (HIGH). Redis is an open source, in-memory database that persists on disk. When parsing an incoming Redis Standard Protocol (RESP) request, Redis allocates memory according to user-specified values which dete...
How severe is CVE-2021-32675?
CVE-2021-32675 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32675?
Check the references section above for vendor advisories and patch information. Affected products include: Redis Redis, Fedoraproject Fedora, Debian Debian Linux, Netapp Management Services For Element Software, Netapp Management Services For Netapp Hci.