Dear subscribers, we have been made aware of critical vulnerability in
Dovecot and Pigeonhole.
Open-Xchange Security Advisory 2019-08-14
Vendor: OX Software GmbH
Internal reference: DOV-3278
Vulnerability type: Improper input validation (CWE-20)
Vulnerable version: All versions prior to 22.214.171.124 and 126.96.36.199
Vulnerable component: IMAP and ManageSieve protocol parsers (before and
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 188.8.131.52, 184.108.40.206
Researcher credits: Nick Roessler and Rafi Rubin, University of Pennsylvania
Vendor notification: 2019-04-13
Solution date: 2019-06-05
Public disclosure: 2019-08-28
CVE reference: CVE-2019-11500
CVSS: 8.1 (CVSS3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
IMAP and ManageSieve protocol parsers do not properly handle NUL byte
when scanning data in quoted strings, leading to out of bounds heap
This vulnerability allows for out-of-bounds writes to objects stored on
the heap up to 8096 bytes in pre-login phase, and 65536 bytes post-login
phase, allowing sufficiently skilled attacker to perform complicated
attacks that can lead to leaking private information or remote code
execution. Abuse of this bug is very difficult to observe, as it does
not necessarily cause a crash. Attempts to abuse this bug are not
directly evident from logs.
Steps to reproduce:
This bug is best observed using valgrind to see the out of bounds read
with following snippet:
perl -e 'print "a id (\"foo\" \"".("x"x1021)."\\A\" \"bar\"
\"\000".("x"x1020)."\\A\")\n"' | nc localhost 143
Operators should update to the latest Patch Release. There is no
workaround for the issue.