CVE-2023-43116: Improper Link Resolution Before File Access ('Link Following')

December 22, 2023 (updated January 3, 2024)

A symbolic link following vulnerability in Buildkite Elastic CI for AWS versions prior to 6.7.1 and 5.22.5 allows the buildkite-agent user to change ownership of arbitrary directories via the PIPELINE_PATH variable in the fix-buildkite-agent-builds-permissions script.

References

github.com/advisories/GHSA-7c44-7j7v-w554
github.com/atredispartners/advisories/blob/master/ATREDIS-2023-0003.md
github.com/buildkite/elastic-ci-stack-for-aws/commit/8f79882b6aa18fb8fc61f10c7047d2907b7a2f69
nvd.nist.gov/vuln/detail/CVE-2023-43116

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