DescriptionWhile investigating bug PROTON-2014, we discovered that under some circumstances Apache Qpid Proton versions 0.9 to 0.27.0 (C library and its language bindings) can connect to a peer anonymously using TLS *even when configured to verify the peer certificate* while used with OpenSSL versions before 1.1.0. This means that an undetected man in the middle attack could be constructed if an attacker can arrange to intercept TLS traffic.
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
qpid-proton (PTS)buster0.22.0-3fixed
sid, trixie, bookworm0.37.0-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[stretch] - qpid-proton <no-dsa> (Minor issue)
[jessie] - qpid-proton <ignored> (Minor issue);h=97c7733;h=159fac1;h=4aea0fd;h=2d3ba8a
Source-wise only fixed in 0.27.1 upstream, but 0.22.0-1 upload in
unstable switched to build against OpenSSL 1.1 adressing the issue.
The description tells that the vulnerability was introduced in 0.9 but the
version in jessie (0.7) seems to be vulnerable too even though one file is
not present in the jessie version. That part do not seem to be essential for
the package to be vulnerable.

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