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CVE Vulnerabilities

CVE-2017-7479

Reachable Assertion

Published: May 15, 2017 | Modified: Apr 20, 2025
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
4 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2017-7479
CWEhttps://cwe.mitre.org/data/definitions/617.html

OpenVPN versions before 2.3.15 and before 2.4.2 are vulnerable to reachable assertion when packet-ID counter rolls over resulting into Denial of Service of server by authenticated attacker.

Weakness

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Software

NameVendorStart VersionEnd Version
OpenvpnOpenvpn*2.3.14 (including)
OpenvpnOpenvpn2.4.0 (including)2.4.0 (including)
OpenvpnOpenvpn2.4.0-alpha2 (including)2.4.0-alpha2 (including)
OpenvpnOpenvpn2.4.0-beta1 (including)2.4.0-beta1 (including)
OpenvpnOpenvpn2.4.0-beta2 (including)2.4.0-beta2 (including)
OpenvpnOpenvpn2.4.0-rc1 (including)2.4.0-rc1 (including)
OpenvpnOpenvpn2.4.0-rc2 (including)2.4.0-rc2 (including)
OpenvpnOpenvpn2.4.1 (including)2.4.1 (including)
OpenvpnUbuntuesm-infra-legacy/trusty*
OpenvpnUbuntuesm-infra/xenial*
OpenvpnUbuntuprecise*
OpenvpnUbuntuprecise/esm*
OpenvpnUbuntutrusty*
OpenvpnUbuntutrusty/esm*
OpenvpnUbuntuupstream*
OpenvpnUbuntuvivid/stable-phone-overlay*
OpenvpnUbuntuxenial*
OpenvpnUbuntuyakkety*
OpenvpnUbuntuzesty*

Extended Description

While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.

Potential Mitigations

References

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