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Fencer Vulns
high 7.0

CVE-2023-43741 json

Buildkite Elastic CI for AWS time-of-check-time-of-use race condition vulnerability

published 2023-12-22 2 y ago modified 2026-06-17 4 mo ago also GHSA-r5hg-349q-mg2q , GO-2024-2440 , EUVD-2023-3282

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/buildkite/elastic-ci-stack-for-aws/v6 6.7.1
  • buildkite elastic_ci_stack 5.22.5, 6.7.1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/atredispartners/advisories/blob/master/ATREDIS-2023-0003.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/buildkite/elastic-ci-stack-for-aws/v6
<6.7.1
6.7.1
go github.com/buildkite/elastic-ci-stack-for-aws
all versions
 no fix listed
go github.com/buildkite/elastic-ci-stack-for-aws/v5
all versions
 no fix listed

Classification

Weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.