drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Zwei Probleme in snapd
Name: |
Zwei Probleme in snapd |
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ID: |
USN-4424-1 |
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Distribution: |
Ubuntu |
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Plattformen: |
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 19.10, Ubuntu 20.04 LTS |
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Datum: |
Mi, 15. Juli 2020, 23:55 |
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Referenzen: |
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11934
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11933 |
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Applikationen: |
Snap |
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Originalnachricht |
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========================================================================== Ubuntu Security Notice USN-4424-1 July 15, 2020
snapd vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS - Ubuntu 19.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS
Summary:
An intended access restriction in snapd could be bypassed by strict mode snaps.
Software Description: - snapd: Daemon and tooling that enable snap packages
Details:
It was discovered that cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices ran on every boot without restrictions. A physical attacker could exploit this to craft cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. (CVE-2020-11933)
It was discovered that snapctl user-open allowed altering the XDG_DATA_DIRS environment variable when calling the system xdg-open. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL. This issue did not affect Ubuntu Core systems. (CVE-2020-11934)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: snapd 2.45.1+20.04.2
Ubuntu 19.10: snapd 2.45.1+19.10.2
Ubuntu 18.04 LTS: snapd 2.45.1+18.04.2
Ubuntu 16.04 LTS: snapd 2.45.1ubuntu0.2
In general, a standard system update will make all the necessary changes. On Ubuntu, snapd will automatically refresh itself to snapd 2.45.2 which is unaffected.
References: https://usn.ubuntu.com/4424-1 CVE-2020-11933, CVE-2020-11934
Package Information: https://launchpad.net/ubuntu/+source/snapd/2.45.1+20.04.2 https://launchpad.net/ubuntu/+source/snapd/2.45.1+19.10.2 https://launchpad.net/ubuntu/+source/snapd/2.45.1+18.04.2 https://launchpad.net/ubuntu/+source/snapd/2.45.1ubuntu0.2
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