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Ubuntu Security Podcast

Episode 87

23 min • 21 augusti 2020

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)
  • 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)
  • 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)
  • 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)
  • 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]

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

  • 1 CVEs addressed in Bionic (18.04 LTS), Focal (20.04 LTS)
  • 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)
  • 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)
  • 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)
  • 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)
  • 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)
  • 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]

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