[github.com/containrrr/shoutrrr/pkg/util] Shoutrrr util package DoS via sending 2000, 4000, or 6000 character messages

The package github.com/containrrr/shoutrrr/pkg/util before 0.6.0 are vulnerable to Denial of Service (DoS) via the util.PartitionMessage function. Exploiting this vulnerability is possible by sending exactly 2000, 4000, or 6000 characters messages.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-25891
• https://github.com/containrrr/shoutrrr/issues/240
• https://github.com/containrrr/shoutrrr/pull/242
• https://github.com/containrrr/shoutrrr/commit/6a27056f9d7522a8b493216195cb7634bf4b5c42
• https://github.com/containrrr/shoutrrr/releases/tag/v0.6.0
• https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMCONTAINRRRSHOUTRRRPKGUTIL-2849059
• https://github.com/advisories/GHSA-477v-w82m-634j