DescriptionAn issue was discovered in tls_verify_crl in ProFTPD through 1.3.6b. Failure to check for the appropriate field of a CRL entry (checking twice for subject, rather than once for subject and once for issuer) prevents some valid CRLs from being taken into account, and can allow clients whose certificates have been revoked to proceed with a connection to the server.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)
Debian Bugs946346

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
trixie, sid1.3.8.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) (master) (1.3.6 branch)
Introduced in: (v1.3.5c)

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