Security issues APFS ENCRYPTED and Keychain Access, solved with Macos High Sierra 10.13 Supplemental Update

Apple a publicat recent un update suplimentar (Supplemental Update) foarte important pentru toti utilizatorii de Mac, care au instalat macOS High Sierra 10.13.

In macOS High Sierra 10.13 Supplemental Update are solving some malfunctions for Adobe InDesign and a bug that did not allow stergerea mesajelor primite in aplicatia Mail de pe conturi de Yahoo!.

The most serious part of this additional update is related to two security issues, ce au venit “la pachet” cu noul sistem de operare High Sierra.

Vulnerabilitate parola criptare pentru APFS (Encrypted) – Disk Utility Bug

A bug in the application Disk Utility that makes visible password for disk volumes formatted APFS Encrypted.
Pe scurt, atunci cand introducem parola de criptate pentru un volum, aceasta este ceruta de doua ori, pentru a fi siguri ca nu am tastat-o gresit prima data. Apoi avem sa ne alegem un “hint” (un cuvant sau o fraza) ca indiciu pentru parola. Bug-ul din Disk Utility, face ca parola sa fie vizibila in locul cuvantului sau frazei de la “hint”. In acest fel, este expusa oricarei persoane care are acces la Mac.
In video postat pe Twitter se vede exact cum se poate afla parola unui volum criptat APFS, cu ajutorul Disk Utility.

Would be interesting why Apple recommends erasing when diskutil can clear hints:
diskutil apfs setPassphraseHint [diskXsX] -user disk -clear pic.twitter.com/0khrm8aTq9

— Felix Schwarz (@felix_schwarz) October 5, 2017

Vulnerabilitate Keychain Access – bypass user password

In mod normal si obligatoriu, cand accesam an account and a password saved in Keychain, ne este ceruta user password Mac. Printr-o vulnerabilitate a MacOS High Sierra, o aplicatie rau-intentionata poate retrieve saved passwords in Keychain Access, sarind peste parola de user Mac prin intermediul unui click sintetic. Fals / simulat.

Released October 5, 2017

StorageKit

Available for: macOS High Sierra 10.13

Impact: A local attacker may gain access to an encrypted APFS volume

Description: If a hint was set in Disk Utility when creating an APFS encrypted volume, the password was stored as the hint. This was addressed by clearing hint storage if the hint was the password, and by improving the logic for storing hints.

CVE-2017-7149: Matheus Mariano of Leet Tech

Security

Available for: macOS High Sierra 10.13

Impact: A malicious application can extract keychain passwords

Description: A method existed for applications to bypass the keychain access prompt with a synthetic click. This was addressed by requiring the user password when prompting for keychain access.

CVE-2017-7150: Patrick Wardle of Synack

New downloads of macOS High Sierra 10.13 include the security content of the macOS High Sierra 10.13 Supplemental Update.

Asadar, daca aveti macOS High Sierra 10.13, este foarte recomandat sa faceti update-ul suplimentar. Acesta este disponibil via Mac App Store, in tab-ul “Updates“(si nu va schimba numarul versiunii). Apple a publicat deja macOS High Sierra 10.13.1 pentru developerii ce au device-urile in Apple Beta Software Program.