receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4718-1 advisory.

    It was discovered that fastd incorrectly handled certain packets. An attacker could possibly use this     issue to cause a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Fix for CVE-2020-27638

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4610-1 advisory.

    It was discovered that fastd did not properly handle receive buffers under certain circumstances. A remote     attacker could possibly use this issue to cause a memory leak, resulting in a denial of service.
    (CVE-2020-27638)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

In fastd, a fast and secure tunnelling daemon, a receive buffer handling problem was discovered which allows a denial of service (memory exhaustion) when receiving packets with an invalid type code.

For Debian 9 stretch, this problem has been fixed in version 18-2+deb9u1.

We recommend that you upgrade your fastd packages.

For the detailed security status of fastd please refer to its security tracker page at: https://security-tracker.debian.org/tracker/fastd

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
146066	Ubuntu 16.04 LTS / 18.04 LTS : fastd vulnerability (USN-4718-1)	Nessus	Ubuntu Local Security Checks	high
142356	Fedora 33 : fastd (2020-13edfc3215)	Nessus	Fedora Local Security Checks	high
142283	Fedora 32 : fastd (2020-495c14a23f)	Nessus	Fedora Local Security Checks	high
142228	Fedora 31 : fastd (2020-01dc2bc62c)	Nessus	Fedora Local Security Checks	high
142055	Ubuntu 20.04 LTS : fastd vulnerability (USN-4610-1)	Nessus	Ubuntu Local Security Checks	high
141872	Debian DLA-2414-1 : fastd security update	Nessus	Debian Local Security Checks	high

Detections

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CVE-2020-27638

high

Tenable Plugins

high

high

high

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high