Episode 229

Ubuntu Security Podcast

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1M ago 13:22

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Overview

As the podcast winds down for a break over the next month, this week we talk about RSA timing side-channel attacks and the recently announced DNSBomb vulnerability as we cover security updates in VLC, OpenSSL, Netatalk, WebKitGTK, amavisd-new, Unbound, Intel Microcode and more.

This week in Ubuntu Security Updates

152 unique CVEs addressed

[USN-6783-1] VLC vulnerabilities (00:54)

2 CVEs addressed in Xenial ESM (16.04 ESM), Bionic ESM (18.04 ESM), Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10)
- CVE-2023-47360
- CVE-2023-47359
integer underflow and a heap buffer overflow -> RCE

[USN-6663-3] OpenSSL update (01:40)

Affecting Noble (24.04 LTS)
[USN-6663-1] OpenSSL update from Episode 220 - hardening improvement to return deterministic random bytes instead of an error when an incorrect padding length is detected during PKCS#1 v1.5 RSA to avoid this being used for possible Bleichenbacher timing attacks

[USN-6673-3] python-cryptography vulnerability (02:32)

1 CVEs addressed in Noble (24.04 LTS)
- CVE-2024-26130
[USN-6673-1] python-cryptography vulnerabilities from Episode 220 - counterpart to the OpenSSL update mentioned earlier

[USN-6736-2] klibc vulnerabilities (02:43)

4 CVEs addressed in Noble (24.04 LTS)
[USN-6736-1] klibc vulnerabilities from Episode 228

[USN-6784-1] cJSON vulnerabilities (02:58)

3 CVEs addressed in Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
2 different researchers fuzzing cJSON APIs
- all different NULL ptr deref - requires particular / “incorrect” or possible misuse use of the APIs (like passing in purposefully corrupted values) so unlikely to be an issue in practice

[USN-6785-1] GNOME Remote Desktop vulnerability (03:52)

1 CVEs addressed in Noble (24.04 LTS)
- CVE-2024-5148
Discovered by a member of the SUSE security team when reviewing g-r-d
Exposed various DBus services that were able to be called by any unprivileged user which would then return the SSL private key used to encrypt the connection - so could allow a local user to possibly spy on the sessions of other users remotely connected to the system

[USN-6786-1] Netatalk vulnerabilities (04:45)

1 CVEs addressed in Focal (20.04 LTS), Jammy (22.04 LTS)
- CVE-2022-22995
Apple file sharing implementation for Linux
If the same path was shared via both AFP and SMB then a remote attacker could combine various operations through both file-systems (like creating a crafted symlink, which would then be followed during a second operation where a file is renamed) to allow them to overwrite arbirary files and hence achieve arbitrary code execution on the host

[USN-6788-1] WebKitGTK vulnerabilities (05:48)

1 CVEs addressed in Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
- CVE-2024-27834
Possible pointer authentication bypass - used on arm64 in particular - demonstrated at Pwn2Own earlier this year by Manfred Paul - $60k

[USN-6789-1] LibreOffice vulnerability (06:28)

1 CVEs addressed in Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
- CVE-2024-3044
Unchecked script execution triggered when clicking on a graphic - allows to run arbitrary scripts without the usual prompt

[USN-6790-1] amavisd-new vulnerability (07:09)

1 CVEs addressed in Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
- CVE-2024-28054
MTA / AV interface - often used in conjunction with Postfix, not just for AV but also can be used to do DKIM verification and integration with spamassassin etc
Misinterpreted MIME message boundaries in emails, allowing email parts to possibly bypass usual checks

[USN-6791-1] Unbound vulnerability (07:46)

1 CVEs addressed in Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
- CVE-2024-33655
DNSBomb attack announced recently at IEEE S&P - affecting multiple different DNS implementations including BIND, Unbound, PowerDNS, Knot, DNSMasq and others
Unbound itself was not necessarily vulnerable to such an attack specifically, but could be used to generate such an attack against others - in particular Unbound had the highest amplification factor of ~22k times - next highest was DNSMasq at ~3k times
Fix involves introducing a number of timeout parameters for various operations and discarding operations if they take longer than this to avoid the ability to “store up” responses to be released at a later time

[USN-6793-1] Git vulnerabilities (09:31)

5 CVEs addressed in Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)

[USN-6792-1] Flask-Security vulnerability

1 CVEs addressed in Bionic ESM (18.04 ESM), Focal (20.04 LTS), Jammy (22.04 LTS)
- CVE-2021-23385

[USN-6794-1] FRR vulnerabilities

4 CVEs addressed in Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)

[USN-6787-1] Jinja2 vulnerability (10:48)

1 CVEs addressed in Trusty ESM (14.04 ESM), Xenial ESM (16.04 ESM), Bionic ESM (18.04 ESM), Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
- CVE-2024-34064
Incorrect handling of various HTML attributes - attacker could then possibly inject arbitrary HTML attrs/values and hence inject JS code to peform XSS attacks etc

[USN-6797-1] Intel Microcode vulnerabilities (11:22)

9 CVEs addressed in Xenial ESM (16.04 ESM), Bionic ESM (18.04 ESM), Focal (20.04 LTS), Jammy (22.04 LTS), Mantic (23.10), Noble (24.04 LTS)
Latest release from upstream - mitigates against various hardware vulns
- A couple issues in SGX/TDX on different Intel Xeon processors:
  - Invalid restrictions -> local root -> super-privesc
  - Invalid input on TDX -> local root -> super-privesc
  - Invalid SGX base key calculation -> info leak
- Transient execution attacks to read privileged information
- DoS through bus lock mishandling or through invalid instruction sequences

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Episode 229

Ubuntu Security Podcast

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