The remote Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5221-1 advisory.

  - 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. (CVE-2021-32626)

  - Redis is an open source, in-memory database that persists on disk. In affected versions an integer     overflow bug in Redis can be exploited to corrupt the heap and potentially result with remote code     execution. The vulnerability involves changing the default proto-max-bulk-len and client-query-buffer-     limit configuration parameters to very large values and constructing specially crafted very large stream     elements. The problem is fixed in Redis 6.2.6, 6.0.16 and 5.0.14. For users unable to upgrade 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. (CVE-2021-32627)

  - Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist     data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result     with remote code execution. The vulnerability involves modifying the default ziplist configuration     parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-     ziplist-value) to a very large value, and then constructing specially crafted commands to create very     large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to     mitigate the problem without patching the redis-server executable is to prevent users from modifying the     above configuration parameters. This can be done using ACL to restrict unprivileged users from using the     CONFIG SET command. (CVE-2021-32628)

  - Redis is an open source, in-memory database that persists on disk. When using the Redis Lua Debugger,     users can send malformed requests that cause the debugger's protocol parser to read data beyond the actual     buffer. This issue affects all versions of Redis with Lua debugging support (3.2 or newer). The problem is     fixed in versions 6.2.6, 6.0.16 and 5.0.14. (CVE-2021-32672)

  - 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.
    (CVE-2021-32675)

  - Redis is an open source, in-memory database that persists on disk. An integer overflow bug affecting all     versions of Redis can be exploited to corrupt the heap and potentially be used to leak arbitrary contents     of the heap or trigger remote code execution. The vulnerability involves changing the default set-max-     intset-entries configuration parameter to a very large value and constructing specially crafted commands     to manipulate sets. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional     workaround to mitigate the problem without patching the redis-server executable is to prevent users from     modifying the set-max-intset-entries configuration parameter. This can be done using ACL to restrict     unprivileged users from using the CONFIG SET command. (CVE-2021-32687)

  - Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the     underlying string library can be used to corrupt the heap and potentially result with denial of service or     remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration     parameter to a very large value and constructing specially crafted network payloads or commands. The     problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. 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. (CVE-2021-41099)

  - 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.
    (CVE-2021-32761)

  - 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. (CVE-2021-21309)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM : Redis vulnerabilities (USN-5221-1)

high Nessus Plugin ID 183135

Version 1.2

Version 1.1

Version 1.1

Version 1.0

Version 1.2 Dec 22, 2023, 3:04 PM CVSSv2 score source (changed from "CVE-2021-21309" to "CVE-2021-32626") Plugin Feed: 202312221504
Version 1.1 Dec 15, 2023, 2:39 PM CVSSv2 score source (changed from "CVE-2021-32626" to "CVE-2021-21309") Plugin Feed: 202312151439
Version 1.1 Dec 22, 2023, 1:07 PM CVSSv2 score source (changed from "CVE-2021-21309" to "CVE-2021-32626") Plugin Feed: 202312221307
Version 1.0 Oct 16, 2023, 7:25 PM New Plugin Feed: 202310161925