Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCH

Summary An infinite-loop vulnerability CWE-835 in the Twisted IMAP4 server lets an authenticated client freeze the whole process with one small command. twisted.mail.imap4.parseNestedParens reads an IMAP literal size with int and never rejects a negative value. A negative size such as -100 drives...