Ceph vulnerabilities

Ceph before versions 20.2.4 and 19.2.6 has a flaw in the Monitor subscription handler that allows a user with only read-only capabilities (mon allow r) to read the entire configuration-key store. This store contains sensitive secrets, including LUKS disk-encryption passphrases and the cephadm SSH private key.

Ceph versions prior to 20.2.4 and 19.2.6, in the RGW SigV4 handler, do not reject requests carrying x-amz-* headers absent from the signed header set. This allows anyone holding a presigned URL to attach arbitrary unsigned x-amz-* headers that RGW honors, potentially leading to privilege escalation.

Ceph versions prior to 20.2.4 and 19.2.6, in RADOS Gateway (RGW), protect STS session tokens with AES-128-CBC without message authentication, allowing an attacker holding a valid STS token to tamper with it undetected and escalate to full RGW administrative access.

Ceph versions prior to 20.2.4 and 19.2.6 use the CephX authentication protocol with AES-128-CBC in an unauthenticated mode, using a hard-coded initialization vector and no message authentication. An attacker with a low-privilege key can forge tickets and gain cluster-wide access, including to privileged components such as Manager, MDS, and OSD.