CVE-2021-32675

NameCVE-2021-32675
DescriptionRedis 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2810-1, DSA-5001-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
redis (PTS)buster5:5.0.14-1+deb10u2fixed
buster (security)5:5.0.14-1+deb10u5fixed
bullseye (security), bullseye5:6.0.16-1+deb11u2fixed
bookworm, bookworm (security)5:7.0.15-1~deb12u1fixed
sid, trixie5:7.0.15-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
redissourcestretch3:3.2.6-3+deb9u8DLA-2810-1
redissourcebuster5:5.0.14-1+deb10u1DSA-5001-1
redissourcebullseye5:6.0.16-1+deb11u1DSA-5001-1
redissource(unstable)5:6.0.16-1

Notes

https://github.com/redis/redis/security/advisories/GHSA-f6pw-v9gw-v64p

Search for package or bug name: Reporting problems