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Debian Security Advisory DSA-3900-1                   security@debian.org
https://www.debian.org/security/                       Sebastien Delafond
June 27, 2017                         https://www.debian.org/security/faq
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Package        : openvpn
CVE ID         : CVE-2017-7479 CVE-2017-7508 CVE-2017-7520 CVE-2017-7521
Debian Bug     : 865480

Several issues were discovered in openvpn, a virtual private network
application.

CVE-2017-7479

    It was discovered that openvpn did not properly handle the
    rollover of packet identifiers. This would allow an authenticated
    remote attacker to cause a denial-of-service via application
    crash.

CVE-2017-7508

    Guido Vranken discovered that openvpn did not properly handle
    specific malformed IPv6 packets. This would allow a remote
    attacker to cause a denial-of-service via application crash.

CVE-2017-7520

    Guido Vranken discovered that openvpn did not properly handle
    clients connecting to an HTTP proxy with NTLMv2
    authentication. This would allow a remote attacker to cause a
    denial-of-service via application crash, or potentially leak
    sensitive information like the user's proxy password.

CVE-2017-7521

    Guido Vranken discovered that openvpn did not properly handle
    some x509 extensions. This would allow a remote attacker to cause
    a denial-of-service via application crash.

For the oldstable distribution (jessie), these problems have been fixed
in version 2.3.4-5+deb8u2.

For the stable distribution (stretch), these problems have been fixed in
version 2.4.0-6+deb9u1.

For the testing distribution (buster), these problems have been fixed
in version 2.4.3-1.

For the unstable distribution (sid), these problems have been fixed in
version 2.4.3-1.

We recommend that you upgrade your openvpn 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
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