Ubuntu Security Podcast

Episode 109

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Overview

This week we look at security updates for containerd, Ruby, the Linux

kernel, Pygments and more, plus we cover some open positions within the
team as well.

This week in Ubuntu Security Updates

28 unique CVEs addressed

[USN-4881-1] containerd vulnerability [00:38]
  • 1 CVEs addressed in Focal (20.04 LTS), Groovy (20.10)
    • CVE-2021-21334
    • When using the containerd CRI implementation (kubernetes container
      • runtime interface) - would share environment variables etc between
      containers that shared the same image - so could allow an inadvertent
      info leak from one container to another - race condition so would be less
      likely to occur if not launching containers in rapid succession which
      share the same image
      [USN-4882-1] Ruby vulnerabilities [01:27]
      • 3 CVEs addressed in Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS), Groovy (20.10)
        • CVE-2020-25613
        • CVE-2020-10933
        • CVE-2020-10663
        • Crafted JSON could result in RCE - could create a malicious object within
          • the interpreter
        • Possible info leak via unintialised memory across socket operations -
          • heap info leak so could expose sensitive data from the interpreter
        • Failure to validate xfer encoding header - could bypass reverse proxy and
          • so be vulnerable to HTTP request smuggling attacks
          [USN-4883-1] Linux kernel vulnerabilities [02:32]
          • 3 CVEs addressed in Trusty ESM (14.04 ESM), Xenial (16.04 LTS), Bionic (18.04 LTS)
            • CVE-2021-27364
            • CVE-2021-27363
            • CVE-2021-27365
            • 4.15 kernel for bionic + 4.4 kernel for xenial
            • 3 iSCSI issues, most important was heap overflow that could be exploited
              • by a local attacker -> code-exec as root
              • Other 2 are info leak via kernel pointers being disclosed to userspace
                • and a OOB read -> crash or possible infoleak
                [USN-4884-1] Linux kernel (OEM) vulnerabilities [03:13]
                • 3 CVEs addressed in Focal (20.04 LTS)
                  • CVE-2021-3348
                  • CVE-2021-3347
                  • CVE-2021-20194
                  • OEM kernel - 5.10
                    • UAF in network block device driver - local attacker could exploit for
                      • crash/codexec
                      [USN-4885-1] Pygments vulnerability [03:36]
                      • 1 CVEs addressed in Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS), Groovy (20.10)
                        • CVE-2021-20270
                        • infinite loop -> CPU based DoS when parsing crafted Standard ML files -
                          • input file containing just ’exception’ would be enough to trigger this
                          [USN-4886-1] Privoxy vulnerabilities [04:18]
                          • 14 CVEs addressed in Trusty ESM (14.04 ESM), Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS), Groovy (20.10)
                            • CVE-2021-20214
                            • CVE-2021-20211
                            • CVE-2021-20276
                            • CVE-2021-20212
                            • CVE-2021-20275
                            • CVE-2021-20273
                            • CVE-2021-20272
                            • CVE-2021-20217
                            • CVE-2021-20216
                            • CVE-2021-20215
                            • CVE-2021-20213
                            • CVE-2021-20210
                            • CVE-2021-20209
                            • CVE-2020-35502
                            • Privacy enhancing HTTP proxy
                            • Incorrect handling of:
                              • CGI requests -> DoS/info-leak
                              • regexes -> DoS (crash + mem-leak)
                              • client tags -> DoS (memory leaks)
                                • [USN-4887-1] Linux kernel vulnerabilities [05:03]
                                • 6 CVEs addressed in Bionic (18.04 LTS), Focal (20.04 LTS), Groovy (20.10)
                                  • CVE-2021-27364
                                  • CVE-2021-27363
                                  • CVE-2020-27170
                                  • CVE-2020-27171
                                  • CVE-2021-27365
                                  • CVE-2021-3444
                                  • BPF verifier failed to properly handle mod32 destination register
                                    • truncation when source register was known to be 0 -> could be turned into
                                    an arbitrary memory read -> info-leak - and can’t rule out arbitrary
                                    memory write -> RCE
                                  • Spectre mitigations for BPF were found to be insufficient - could allow
                                    • an attacker to read entirety of kernel memory via speculative execution
                                    attack through BPF
                                  • iSCSI issues discussed earlier too
                                    • Goings on in Ubuntu Security Community
                                    Hiring [07:04]
                                    AppArmor Security Engineer
                                    • https://canonical.com/careers/2114847/apparmor-security-engineer-remote
                                      • Ubuntu Security Engineer
                                      • https://canonical.com/careers/2612092/ubuntu-security-engineer-remote
                                        • Security Engineer - Ubuntu
                                        • https://canonical.com/careers/2925180/security-engineer-ubuntu-remote
                                          • Get in contact
                                          • [email protected]
                                          • #ubuntu-security on the Libera.Chat IRC network
                                          • ubuntu-hardened mailing list
                                          • Security section on discourse.ubuntu.com
                                          • @ubuntu_sec on twitter
                                            • ...more
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                                            Ubuntu Security PodcastBy Ubuntu Security Team
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