What’s Vulnerable › Vulnerabilities

CVE-2018-12088

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-06-10 · updated 2026-06-17
• Weakness: CWE-20

Description

S3QL before 2.27 mishandles checksumming, and consequently allows replay attacks in which an attacker who controls the backend can present old versions of the filesystem metadata database as up-to-date, temporarily inject zero-valued bytes into files, or temporarily hide parts of files. This is related to the checksum_basic_mapping function.

Affected products

• S3Ql Project S3Ql: before 2.27 — fixed in 2.27

How to fix

Upgrade to a fixed version: S3Ql Project S3Ql 2.27. Check the vendor advisory for mitigations.

References

• https://bitbucket.org/nikratio/s3ql/commits/85aba5c2d5c81453a73a50ed638adaeef0521020
• https://bitbucket.org/nikratio/s3ql/issues/272/t3_verifypy-test_retrieve-sometimes-fails
• https://groups.google.com/forum/#%21topic/s3ql/4TzCVIMkA4o
• https://bitbucket.org/nikratio/s3ql/commits/85aba5c2d5c81453a73a50ed638adaeef0521020
• https://bitbucket.org/nikratio/s3ql/issues/272/t3_verifypy-test_retrieve-sometimes-fails
• https://groups.google.com/forum/#%21topic/s3ql/4TzCVIMkA4o

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