Episode 137

Ubuntu Security Podcast

Overview

This week we look at some details of the 29 unique CVEs addressed across the supported Ubuntu releases in the past 7 days and more.

This week in Ubuntu Security Updates

29 unique CVEs addressed

[USN-5131-1] Firefox vulnerabilities [00:42]

• 6 CVEs addressed in Bionic (18.04 LTS), Focal (20.04 LTS), Hirsute (21.04), Impish (21.10)
  • CVE-2021-38509
  • CVE-2021-38508
  • CVE-2021-38507
  • CVE-2021-38506
  • CVE-2021-38504
  • CVE-2021-38503
• 94.0
  • Copy image link - copies final image URL after redirects - if a page were to then combine this with a content security policy which blocked a redirect, the image URL may then contain any authentication tokens - and so if a page could trick a user into copying and pasting that image URL into the page an attacker could steal their auth token
  • Various web framework issues

[USN-5132-1] Thunderbird vulnerabilities [01:56]

• 6 CVEs addressed in Impish (21.10)
  • CVE-2021-38501
  • CVE-2021-38500
  • CVE-2021-38498
  • CVE-2021-38497
  • CVE-2021-38496
  • CVE-2021-32810
• 91.2.1
  • Usual web framework issues

[USN-5133-1] ICU vulnerability [02:17]

• 1 CVEs addressed in Trusty ESM (14.04 ESM), Xenial ESM (16.04 ESM), Bionic (18.04 LTS)
  • CVE-2020-21913
• unicode handling library
• UAF - could be triggered if was packaging the ICU data with malicious input -> crash / RCU

[USN-5135-1] Linux kernel vulnerability [02:43]

• 1 CVEs addressed in Focal (20.04 LTS), Hirsute (21.04), Impish (21.10)
  • CVE-2021-3759
• impish (5.13), hirsute (5.11), focal hwe (5.11)
• IPC memory objects not properly accounted for in memcg - could allow to bypass limits and cause DoS

[USN-5130-1] Linux kernel vulnerabilities [03:24]

• 2 CVEs addressed in Trusty ESM (14.04 ESM)
  • CVE-2020-29660
  • CVE-2020-29661
• 3.13
• 2 vulns courtesy of Jann Horn (GPZ) - in tty subsystem - lock order issues - UAF - DoS/privesc (Episode 106)

[USN-5136-1] Linux kernel vulnerabilities [04:06]

• 9 CVEs addressed in Trusty ESM (14.04 ESM), Xenial ESM (16.04 ESM), Bionic (18.04 LTS)
  • CVE-2021-42252
  • CVE-2021-38199
  • CVE-2021-3759
  • CVE-2021-3753
  • CVE-2021-3743
  • CVE-2021-3655
  • CVE-2020-36385
  • CVE-2020-36322
  • CVE-2019-19449
• 4.15 (bionic, xenial hwe, trusty azure)
• IPC memory object leak plus various other vulns from Episode 136

[USN-5137-1] Linux kernel vulnerabilities [04:48]

• 10 CVEs addressed in Bionic (18.04 LTS), Focal (20.04 LTS)
  • CVE-2021-42252
  • CVE-2021-3759
  • CVE-2021-3753
  • CVE-2021-3743
  • CVE-2021-3739
  • CVE-2021-35477
  • CVE-2021-34556
  • CVE-2021-3428
  • CVE-2020-36385
  • CVE-2019-19449
• 5.4 (focal, bionic hwe)

[USN-5134-1] Docker vulnerability [04:50]

• 1 CVEs addressed in Bionic (18.04 LTS), Focal (20.04 LTS), Hirsute (21.04), Impish (21.10)
  • CVE-2021-41092
• If was using a private registry for docker login but also had configured credsStore and credsHelper in ~/.docker/config.json and these were not able to be executed (ie. execute bit not set or not in $PATH), then creds would get sent to the public docker registry rather than the configured private registry.

Goings on in Ubuntu Security Community

Hiring [06:00]

Security - Product Manager

• HOME BASED - EMEA (Europe, Middle East, Africa)
• Role includes:
  • guiding the evolution of security offerings from Canonical and Ubuntu
  • driving compliance and certification of Ubuntu
  • engaging with the open source security community
  • telling the story of Canonical’s work to deliver secure platforms
• https://canonical.com/careers/2278145/security-product-manager-remote

Get in contact

• [e-mail]
• #ubuntu-security on the Libera.Chat IRC network
• ubuntu-hardened mailing list
• Security section on discourse.ubuntu.com
• @ubuntu_sec on twitter