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CVE-2021-32761

CVE-2021-32761 · Integer overflow issues with *BIT commands on 32-bit systems

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5. On 32-bit systems, Redis `*BIT*` command are vulnerable to integer overflow that can potentially be exploited to corrupt the heap, leak arbitrary heap contents or trigger remote code execution. The vulnerability involves changing the default `proto-max-bulk-len` configuration parameter to a very large value and constructing specially crafted commands bit commands. This problem only affects Redis on 32-bit platforms, or compiled as a 32-bit binary. Redis versions 5.0.`3m 6.0.15, and 6.2.5 contain patches for this issue. An additional workaround to mitigate the problem without patching the `redis-server` executable is to prevent users from modifying the `proto-max-bulk-len` configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

CVSS 7.5 · High · EPSS 30.1% · Fix available

Published
Updated

Stack: system · database

Affected products and versions

  • redis

    Versions
    • >= 2.2, < 5.0.13: Affected
    • >= 6.0.0, < 6.0.15: Affected
    • >= 6.2.0, < 6.2.5: Affected

    No fix published

  • redis Debian:12

    Affected ranges
    • ECOSYSTEM: < 5:6.0.15-1

    Update to 5:6.0.15-1

  • redis Debian:13

    Affected ranges
    • ECOSYSTEM: < 5:6.0.15-1

    Update to 5:6.0.15-1

  • redis Debian:14

    Affected ranges
    • ECOSYSTEM: < 5:6.0.15-1

    Update to 5:6.0.15-1

  • redis Ubuntu:Pro:14.04:LTS

    Versions
    • 2:2.6.13-1
    • 2:2.6.16-3
    • 2:2.8.0-1
    • 2:2.8.2-1
    • 2:2.8.4-2
    • 2:2.8.4-2ubuntu0.2
    • 2:2.8.4-2ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: < 2:2.8.4-2ubuntu0.2+esm2

    Update to 2:2.8.4-2ubuntu0.2+esm2

  • redis Ubuntu:Pro:16.04:LTS

    Versions
    • 2:3.0.3-3
    • 2:3.0.5-1
    • 2:3.0.5-2
    • 2:3.0.5-3
    • 2:3.0.5-4
    • 2:3.0.6-1
    • 2:3.0.6-1ubuntu0.2
    • 2:3.0.6-1ubuntu0.3
    • 2:3.0.6-1ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 2:3.0.6-1ubuntu0.4+esm1

    Update to 2:3.0.6-1ubuntu0.4+esm1

  • redis Ubuntu:Pro:18.04:LTS

    Versions
    • 4:4.0.1-7
    • 4:4.0.2-6
    • 4:4.0.2-9
    • 5:4.0.5-1
    • 5:4.0.6-1
    • 5:4.0.6-2
    • 5:4.0.7-1
    • 5:4.0.8-1
    • 5:4.0.8-2
    • 5:4.0.9-1
    • 5:4.0.9-1ubuntu0.1
    • 5:4.0.9-1ubuntu0.2
    • 5:4.0.9-1ubuntu0.2+esm2
    Affected ranges
    • ECOSYSTEM: < 5:4.0.9-1ubuntu0.2+esm3

    Update to 5:4.0.9-1ubuntu0.2+esm3

Original sources

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