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Debian Security Advisory DSA-3299-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
July 02, 2015                         https://www.debian.org/security/faq
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Package        : stunnel4
CVE ID         : CVE-2015-3644
Debian Bug     : 785352

Johan Olofsson discovered an authentication bypass vulnerability in
Stunnel, a program designed to work as an universal SSL tunnel for
network daemons. When Stunnel in server mode is used with the redirect
option and certificate-based authentication is enabled with "verify = 2"
or higher, then only the initial connection is redirected to the hosts
specified with "redirect". This allows a remote attacker to bypass
authentication.

For the stable distribution (jessie), this problem has been fixed in
version 3:5.06-2+deb8u1.

For the testing distribution (stretch), this problem has been fixed
in version 3:5.18-1.

For the unstable distribution (sid), this problem has been fixed in
version 3:5.18-1.

We recommend that you upgrade your stunnel4 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org