University of Washington IMAP Toolkit 2007f on UNIX, as used in imap_open()
in PHP and other products, launches an rsh command (by means of the
imap_rimap function in c-client/imap4r1.c and the tcp_aopen function in
osdep/unix/tcp_unix.c) without preventing argument injection, which might
allow remote attackers to execute arbitrary OS commands if the IMAP server
name is untrusted input (e.g., entered by a user of a web application) and if
rsh has been replaced by a program with different argument semantics. For
example, if rsh is a link to ssh (as seen on Debian and Ubuntu systems), then
the attack can use an IMAP server name containing a "-oProxyCommand"
argument. -- CVE listing
Gentoo Security Scout
Severity B2 because this has the potential of RCE in situations where IMAP server connections are user-configurable (eg. in webmails).
Upstream has a patch:
Also, new releases tagged upstream:
Please note the PHP-7.0 branch is now EOL'd.
Added to an existing GLSA request.
This issue was resolved and addressed in
GLSA 202003-57 at https://security.gentoo.org/glsa/202003-57
by GLSA coordinator Thomas Deutschmann (whissi).