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OpenAdvisories
High · 7.5 CVE-2021-32626 EUVD-2021-19457

Lua scripts can overflow the heap-based Lua stack in Redis

Published Oct 4, 2021 · Updated Aug 3, 2024 · Assigned by GitHub_M

Vendor: Redis Product: Redis Package: redis Package: redis Package: redis Package: redis Ecosystem: Alpine Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

Redis is an open source, in-memory database that persists on disk. In affected versions specially crafted Lua scripts executing in Redis can cause the heap-based Lua stack to be overflowed, due to incomplete checks for this condition. This can result with heap corruption and potentially remote code execution. This problem exists in all versions of Redis with Lua scripting support, starting from 2.6. The problem is fixed in versions 6.2.6, 6.0.16 and 5.0.14. For users unable to update an additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

Affected products

VendorProductAffectedFixed
redis redis >= 6.2.0, < 6.2.6, >= 6.0.0, < 6.0.16, >= 2.6.0, < 5.0.14 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 redis 5:6.0.16-1 —
Debian 13 redis 5:6.0.16-1 —
Debian 12 redis 5:6.0.16-1 —
Debian 11 redis 5:6.0.16-1+deb11u1 DSA-5001-1
Debian 10 redis 5:5.0.14-1+deb10u1 DSA-5001-1
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Debian 9 redis 3:3.2.6-3+deb9u8 DLA-2810-1

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu Pro 20.04 LTS redis 5:5.0.7-2ubuntu0.1+esm1 USN-5221-1
Ubuntu Pro 18.04 LTS redis 5:4.0.9-1ubuntu0.2+esm3 USN-5221-1
Ubuntu Pro 16.04 LTS redis 2:3.0.6-1ubuntu0.4+esm1 USN-5221-1
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 14.04 LTS redis 2:2.8.4-2ubuntu0.2+esm2 USN-5221-1

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 8 redis +2 5.0.3-5.module+el8.4.0+12927+b9845322 RHSA-2021:3945, RHSA-2021:3918
RHEL 3 rh-redis5-redis 5.0.5-3.el7 RHSA-2021:3947
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 8.2 EUS redis +2 5.0.3-5.module+el8.2.0+12926+485b5fc9 RHSA-2021:3944
RHEL 8.1 EUS redis +2 5.0.3-5.module+el8.1.0+12925+6460abef RHSA-2021:3946
Red Hat OpenStack 13 redis 3.2.8-5.el7ost RHSA-2021:3980
Red Hat OpenStack 10 redis 3.2.8-5.el7ost RHSA-2021:3971

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 8 redis +2 5.0.3-5.module_el8.4.0+2583+b9845322 ALSA-2021:3945, ALSA-2021:3918

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 8 redis 5.0.3-5.module+el8.4.0+659+cf535ef1 RLSA-2021:3945, RLSA-2021:3918

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP3 redis 6.0.14-6.8.1 SUSE-SU-2021:3772-1
SLES 15 SP2 redis 6.0.14-6.8.1 SUSE-SU-2021:3772-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed redis 6.2.6-1.1 openSUSE-SU-2024:11563-1
openSUSE Leap 15.3 redis 6.0.14-6.8.1 openSUSE-SU-2021:3772-1

Alpine

Security tracker ↗
ReleasePackageFixed inAdvisory
Alpine v3.24 redis 6.2.6-r0 —
Alpine v3.23 redis 6.2.6-r0 —
Alpine v3.22 redis 6.2.6-r0 —
Alpine v3.21 redis 6.2.6-r0 —
Alpine v3.20 redis 6.2.6-r0 —
Show 9 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Alpine v3.19 redis 6.2.6-r0 —
Alpine v3.18 redis 6.2.6-r0 —
Alpine v3.17 redis 6.2.6-r0 —
Alpine v3.16 redis 6.2.6-r0 —
Alpine v3.15 redis 6.2.6-r0 —
Alpine v3.14 redis 6.2.6-r0 —
Alpine v3.13 redis 6.0.16-r0 —
Alpine v3.12 redis 5.0.14-r0 —
Alpine v3.11 redis 5.0.14-r0 —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 2 (CBL-Mariner) redis 6.2.6-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 8 redis +2 5.0.3-5.module+el8.4.0+20382+7694043a ELSA-2021-3945, ELSA-2021-3918

Advisories 20

References