CVSS: 8.8EPSS: 0%CPEs: 2EXPL: 0CVE-2023-43631 – SSH as Root Unlockable Without Triggering Measured Boot
https://notcve.org/view.php?id=CVE-2023-43631
21 Sep 2023 — On boot, the Pillar eve container checks for the existence and content of “/config/authorized_keys”. If the file is present, and contains a supported public key, the container will go on to open port 22 and enable sshd with the given keys as the authorized keys for root login. An attacker could easily add their own keys and gain full control over the system without triggering the “measured boot” mechanism implemented by EVE OS, and without marking the device as “UUD” (“Unknown Update Detected”). This is bec... • https://asrg.io/security-advisories/cve-2023-43631 • CWE-522: Insufficiently Protected Credentials CWE-922: Insecure Storage of Sensitive Information •
CVSS: 9.9EPSS: 0%CPEs: 1EXPL: 0CVE-2023-43632 – Freely Allocate Buffer on The Stack With Data From Socket
https://notcve.org/view.php?id=CVE-2023-43632
21 Sep 2023 — As noted in the “VTPM.md” file in the eve documentation, “VTPM is a server listening on port 8877 in EVE, exposing limited functionality of the TPM to the clients. VTPM allows clients to execute tpm2-tools binaries from a list of hardcoded options” The communication with this server is done using protobuf, and the data is comprised of 2 parts: 1. Header 2. Data When a connection is made, the server is waiting for 4 bytes of data, which will be the header, and these 4 bytes would be parsed as uint32 size of ... • https://asrg.io/security-advisories/cve-2023-43632 • CWE-770: Allocation of Resources Without Limits or Throttling CWE-789: Memory Allocation with Excessive Size Value •
CVSS: 8.8EPSS: 0%CPEs: 1EXPL: 0CVE-2023-43635 – Vault Key Sealed With SHA1 PCRs
https://notcve.org/view.php?id=CVE-2023-43635
20 Sep 2023 — Vault Key Sealed With SHA1 PCRs The measured boot solution implemented in EVE OS leans on a PCR locking mechanism. Different parts of the system update different PCR values in the TPM, resulting in a unique value for each PCR entry. These PCRs are then used in order to seal/unseal a key from the TPM which is used to encrypt/decrypt the “vault” directory. This “vault” directory is the most sensitive point in the system and as such, its content should be protected. This mechanism is noted in Zededa’s document... • https://asrg.io/security-advisories/cve-2023-43635 • CWE-327: Use of a Broken or Risky Cryptographic Algorithm CWE-328: Use of Weak Hash CWE-522: Insufficiently Protected Credentials •
CVSS: 8.8EPSS: 0%CPEs: 2EXPL: 0CVE-2023-43636 – Rootfs Not Protected
https://notcve.org/view.php?id=CVE-2023-43636
20 Sep 2023 — In EVE OS, the “measured boot” mechanism prevents a compromised device from accessing the encrypted data located in the vault. As per the “measured boot” design, the PCR values calculated at different stages of the boot process will change if any of their respective parts are changed. This includes, among other things, the configuration of the bios, grub, the kernel cmdline, initrd, and more. However, this mechanism does not validate the entire rootfs, so an attacker can edit the filesystem and gain control... • https://asrg.io/security-advisories/cve-2023-43636 • CWE-345: Insufficient Verification of Data Authenticity •
CVSS: 8.8EPSS: 0%CPEs: 1EXPL: 0CVE-2023-43630 – Config Partition Not Measured From 2 Fronts
https://notcve.org/view.php?id=CVE-2023-43630
20 Sep 2023 — PCR14 is not in the list of PCRs that seal/unseal the “vault” key, but due to the change that was implemented in commit “7638364bc0acf8b5c481b5ce5fea11ad44ad7fd4”, fixing this issue alone would not solve the problem of the config partition not being measured correctly. Also, the “vault” key is sealed/unsealed with SHA1 PCRs instead of SHA256. This issue was somewhat mitigated due to all of the PCR extend functions updating both the values of SHA256 and SHA1 for a given PCR ID. However, due to the change tha... • https://asrg.io/security-advisories/cve-2023-43630 • CWE-328: Use of Weak Hash CWE-522: Insufficiently Protected Credentials CWE-922: Insecure Storage of Sensitive Information •