CVE-2015-5296

NameCVE-2015-5296
DescriptionSamba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-379-1, DSA-3433-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
samba (PTS)stretch (security), stretch2:4.5.16+dfsg-1+deb9u2fixed
buster2:4.9.5+dfsg-5fixed
buster (security)2:4.9.5+dfsg-5+deb10u1fixed
bullseye, sid2:4.12.5+dfsg-3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
sambasourcesqueeze2:3.5.6~dfsg-3squeeze13DLA-379-1
sambasourcewheezy2:3.6.6-6+deb7u6DSA-3433-1
sambasourcejessie2:4.1.17+dfsg-2+deb8u1DSA-3433-1
sambasource(unstable)2:4.1.22+dfsg-1

Notes

https://www.samba.org/samba/security/CVE-2015-5296.html

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