DescriptionAn issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
proftpd-dfsg (PTS)buster1.3.6-4+deb10u6fixed
buster (security)1.3.6-4+deb10u4fixed
sid, trixie1.3.8.b+dfsg-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
proftpd-dfsgsourcejessie(not affected)
proftpd-dfsgsourcestretch(not affected)


[stretch] - proftpd-dfsg <not-affected> (Bug was introduced in 1.3.5c)
[jessie] - proftpd-dfsg <not-affected> (Bug was introduced in 1.3.5c)
Introduced in: (v1.3.5c)

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