Episode 87

Ubuntu Security Podcast

Overview

This week we look at the Drovorub Linux malware outed by the NSA/FBI plus we detail security updates for Dovecot, Apache, Salt, the Linux kernel and more.

This week in Ubuntu Security Updates

24 unique CVEs addressed

[USN-4456-1, USN-4456-2] Dovecot vulnerabilities [00:46]

• 3 CVEs addressed in Trusty ESM (14.04 ESM), Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS)
  • CVE-2020-12674
  • CVE-2020-12673
  • CVE-2020-12100
• 3 DoS issues - nested MIME -> resource exhaustion, Compuserve RPA auth mechanism (rare) -> zero length message -> assert fail, NTLM missing length check -> buffer over read -> crash

[USN-4457-1, USN-4457-2] Software Properties vulnerability [01:39]

• 1 CVEs addressed in Trusty ESM (14.04 ESM), Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS)
  • CVE-2020-15709
• add-apt-repository ANSI escape sequence display from launchpad PPA description

[USN-4458-1] Apache HTTP Server vulnerabilities [02:27]

• 5 CVEs addressed in Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS)
  • CVE-2020-11993
  • CVE-2020-11984
  • CVE-2020-9490
  • CVE-2020-1934
  • CVE-2020-1927
• mod_rewrite could be tricked into redirecting to an unexpected URL via newlines encoded into the request URL
• use of uninitialized memory when proxying to a malicious FTP server -> info leak
• 2 HTTP/2 issues - improper handling of Cache-Digest headers and certain logging statements -> crash, DoS
• buffer overflow in mod_proxy_uwsgi - crash / code exec

[USN-4459-1] Salt vulnerabilities [03:18]

• 5 CVEs addressed in Xenial (16.04 LTS), Bionic (18.04 LTS)
  • CVE-2020-11652
  • CVE-2020-11651
  • CVE-2019-17361
  • CVE-2018-15751
  • CVE-2018-15750
• File enumeration on remote server -> info leak
• Authentication bypass
• Command injection from unauthenticated users -> code exec on salt-api host
• Failure to validate method calls and sanitize paths - access control bypass

[USN-4460-1] Oniguruma vulnerabilities [03:58]

• 4 CVEs addressed in Trusty ESM (14.04 ESM)
  • CVE-2019-19246
  • CVE-2019-19204
  • CVE-2019-19012
  • CVE-2019-16163
• regex library used by PHP and Ruby -> various issues leading to DoS / info leak etc

[USN-4461-1] Ark vulnerability [04:20]

• 1 CVEs addressed in Bionic (18.04 LTS), Focal (20.04 LTS)
  • CVE-2020-16116
• KDE archive handler - malicious ZIP files could contain files outside the working directory (zip-slip)

[USN-4465-1] Linux kernel vulnerabilities [04:50]

• 3 CVEs addressed in Bionic (18.04 LTS)
  • CVE-2020-15393
  • CVE-2020-12771
  • CVE-2020-12655
• 5.3 (hwe)
• Memory leak in USB testing driver on disconnect - so physical attacker could add / remove device and eventually exhaust memory
• bcache deadlock -> DoS
• Crafted XFS metadata could cause a sync of excessive duration -> DoS

[USN-4462-1] Linux kernel vulnerability [05:53]

• 1 CVEs addressed in Bionic (18.04 LTS)
  • CVE-2020-12771
• 5.0 (gke / oem)
• bcache deadlock -> DoS

[USN-4463-1] Linux kernel vulnerabilities [06:06]

• 2 CVEs addressed in Trusty ESM (14.04 ESM), Xenial (16.04 LTS)
  • CVE-2020-15393
  • CVE-2020-12771
• 4.4 (xenial / trusy esm hwe)
• bcache deadlock
• usb testing driver memory leak

[USN-4464-1] GNOME Shell vulnerability [06:24]

• 1 CVEs addressed in Focal (20.04 LTS)
  • CVE-2020-17489
• Could show the login password when logging out if had set it visible during login

[USN-4466-1] curl vulnerability [06:53]

• 1 CVEs addressed in Xenial (16.04 LTS), Bionic (18.04 LTS), Focal (20.04 LTS)
  • CVE-2020-8231
• libcurl - improper handling of the CURLOPT_CONNECT_ONLY option -> could connect to wrong destination and so expose sensitive info

Goings on in Ubuntu Security Community

Joe and Alex discuss Drovorub Linux malware [07:24]

• https://media.defense.gov/2020/Aug/13/2002476465/-1/-1/0/CSA_DROVORUB_RUSSIAN_GRU_MALWARE_AUG_2020.PDF

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