Ubuntu 18.04 systemd safety replace breaks DNS in Azure • The Register



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Microsoft Azure clients working Canonical’s Ubuntu 18.04 (also referred to as Bionic Beaver) within the cloud have seen their purposes crash after a buggy safety replace to systemd broke DNS queries.

The scenario is as unusual because it sounds: Should you’re working Ubuntu 18.04 in an Azure digital machine and also you put in the systemd 237-3ubuntu10.54 safety replace, you in all probability could not use DNS contained in the digital machine, inflicting purposes and different software program that depends on area identify lookups to cease working correctly.

“As of roughly 06:00 UTC on August 30, 2022, a number of clients working Ubuntu 18.04 (bionic) VMs lately upgraded to systemd model 237-3ubuntu10.54 have reported experiencing DNS errors when attempting to entry their sources. “, an replace to the Microsoft Azure standing web page mentioned on Tuesday.

Whereas the problem is restricted to this model of Ubuntu Linux, it has confirmed profitable for these affected.

A person publish on an Ubuntu discussion board by the identify of Luciano Santos de Silva wrote: “Hey guys, nothing works. My app hasn’t labored since early this morning. We have already tried rebooting the nodes, rebooting the digital machine, however nothing.” been working and we have no replace from Microsoft. 4 hours in the past they mentioned, “Extra data shall be supplied inside 60 minutes, once we look ahead to studying extra about root trigger and mitigation workflows.”

Others are reporting that the problematic replace has affected Azure Kubernetes Service (AKS) clusters. And issues are not going properly in line with the Azure dashboard, which is at present affected by outage warning icons world wide for a number of cloud providers.

DNS issues resulting from systemd update on Ubuntu 18.04

Azure Dashboard… DNS points stemming from systemd replace on Ubuntu 18.04

The Ubuntu replace problem has been mirrored on the Azure web page at downdetector.com, which at present exhibits elevated stories of points.

In line with Microsoft, the systemd bug has additionally affected Azure Authorities and Azure China clients. The Home windows large recommends that Ubuntu 18.04 customers disable computerized safety updates for now. Drink.

The newest replace to Microsoft Azure occurred simply after 1500 UTC. Anticipate its subsequent replace round 2100 UTC, “or as occasions warrant.”

The systemd patch is required. Addresses CVE-2022-2526, a use-after-free() vulnerability that might be exploited to trigger a crash or execute arbitrary code on a weak field.

“This problem happens as a result of the on_stream_io() perform and dns_stream_complete() perform in ‘resolved-dns-stream.c’ don’t increment the reference depend for the DnsStream object,” the RedHat bug report explains. “Subsequently, different referred to as features and callbacks can dereference the DNSStream object, inflicting use after free when the reference remains to be used later.”

However making use of the patch breaks DNS on Ubuntu 18.04, or fairly it did: the buggy replace was pulled to repair it. Different variations of Ubuntu, together with xenial, trusty, jammy, and focal, will not be affected.

For many who have already utilized the fallacious patch, there’s a workaround which is to edit the resolve.conf file. One other resolution prompt by Microsoft Azure is to easily “restart the affected VM situations in order that they obtain a brand new DHCP lease and new DNS decision(s).” ®

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Ubuntu 18.04 systemd security update breaks DNS in Azure • The Register