CVE-2023-5536 — A feature in LXD (LP#1829071), affects the default configuration of Ubuntu Serve

A feature in LXD (LP#1829071), affects the default configuration of Ubuntu Server which allows privileged users in the lxd group to escalate their privilege to root without requiring a sudo password.

01What is this vulnerability?

A feature in LXD (LP#1829071), affects the default configuration of Ubuntu Server which allows privileged users in the lxd group to escalate their privilege to root without requiring a sudo password.

02Affected products

Vendor	Product	Versions
Canonical	Ubuntu Server	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-12-12T01:51:08.849Z
• Last modified: 2024-08-02T07:59:44.785Z

09References

• discourse.ubuntu.com — https://discourse.ubuntu.com/t/easy-multi-user-lxd-setup/26215/4
• ubuntu.com — https://ubuntu.com/security/CVE-2023-5536
• bugs.launchpad.net — https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1829071
• cve.mitre.org — https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-5536