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AUSCERT External Security Bulletin Redistribution
ESB-2017.1614
openvpn security update
28 June 2017
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AusCERT Security Bulletin Summary
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Product: openvpn
Publisher: Debian
Operating System: Debian GNU/Linux 8
Debian GNU/Linux 9
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-7521 CVE-2017-7520 CVE-2017-7508
CVE-2017-7479
Reference: ESB-2017.1584
ESB-2017.1561
ESB-2017.1545
ESB-2017.1214
Original Bulletin:
http://www.debian.org/security/2017/dsa-3900
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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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