A data validation flaw was found in the way gnupg processes file names during decryption and signature validation. An attacker may be able to inject messages into gnupg verbose message logging which may have the potential to bypass the integrity of signature authentication mechanisms and could have other unintended consequences if applications take action(s) based on parsed verbose gnupg output.

Mitigation

This flaw can be mitigated by appending the --no-verbose command line flag.

References

bugzilla.redhat.com/show_bug.cgi?id=1589620

www.cve.org/CVERecord?id=CVE-2018-12020 https://nvd.nist.gov/vuln/detail/CVE-2018-12020 https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000425.html

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