CVE-2023-43741: Time-of-check Time-of-use (TOCTOU) Race Condition

December 22, 2023 (updated January 3, 2024)

A time-of-check-time-of-use race condition vulnerability in Buildkite Elastic CI for AWS versions prior to 6.7.1 and 5.22.5 allows the buildkite-agent user to bypass a symbolic link check for the PIPELINE_PATH variable in the fix-buildkite-agent-builds-permissions script.

References

github.com/advisories/GHSA-r5hg-349q-mg2q
github.com/atredispartners/advisories/blob/master/ATREDIS-2023-0003.md
github.com/buildkite/elastic-ci-stack-for-aws/commit/edad0b158ea10a6647bb1c84629d93f5c3d8770e
nvd.nist.gov/vuln/detail/CVE-2023-43741

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