Package Instance

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Fix of CVE-2021-40525 do not prepend delimiters upon valid directory validations. Affected implementations include the maildir mailbox store and the Sieve file repository. This enables a user to access other users data stores (limited to user names being prefixed by the value of the username being used).

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Apache James ManagedSieve implementation alongside with the file storage for sieve scripts is vulnerable to path traversal, allowing reading and writing any file. This vulnerability had been patched in Apache James and higher. We recommend the upgrade. Distributed and Cassandra based products are also not impacted.

Apache James server: Privilege escalation via JMX pre-authentication deserialization
Apache James prior to version 3.7.5 and 3.8.0 exposes a JMX endpoint on localhost subject to pre-authentication deserialisation of untrusted data.
Given a deserialisation gadjet, this could be leveraged as part of an exploit chain that could result in privilege escalation.
Note that by default JMX endpoint is only bound locally.

We recommend users to:
 - Upgrade to a non-vulnerable Apache James version

 - Run Apache James isolated from other processes (docker - dedicated virtual machine)
 - If possible turn off JMX

Loop with Unreachable Exit Condition ('Infinite Loop')
In Apache James, while fuzzing with Jazzer the IMAP parsing stack, we discover that crafted APPEND and STATUS IMAP command could be used to trigger infinite loops resulting in expensive CPU computations and OutOfMemory exceptions.This vulnerability had been patched in Apache James and higher. We recommend the upgrade.

Improper Neutralization of Special Elements used in a Command ('Command Injection')
Apache James prior to release is vulnerable to a buffering attack relying on the use of the STARTTLS command. This can result in Man-in -the-middle command injection attacks, leading potentially to leakage of sensible information.

Apache James vulnerable to buffering attack
Apache James prior to release 3.6.3 and 3.7.1 is vulnerable to a buffering attack relying on the use of the STARTTLS command. Fix of CVE-2021-38542, which solved similar problem fron Apache James 3.6.1, is subject to a parser differential and do not take into account concurrent requests.

Regular expression Denial of Service
In Apache James, using Jazzer fuzzer, we identified that an IMAP user can craft IMAP LIST commands to orchestrate a Denial Of Service using a vulnerable Regular expression. which enforce the use of RE2J regular expression engine to execute regex in linear time without back-tracking.