CVE-2021-33477

rxvt-unicode 9.22, rxvt 2.7.10, mrxvt 0.5.4, and Eterm 0.9.7 allow (potentially remote) code execution because of improper handling of certain escape sequences (ESC G Q). A response is terminated by a newline.

rxvt-unicode 9.22, rxvt 2.7.10, mrxvt 0.5.4, and Eterm 0.9.7 allow (potentially remote) code execution because of improper handling of certain escape sequences (ESC G Q). A response is terminated by a newline.

rxvt-unicode 9.22, rxvt 2.7.10, mrxvt 0.5.4, and Eterm 0.9.7 allow (potentially remote) code execution because of improper handling of certain escape sequences (ESC G Q). A response is terminated by a newline (CVE-2021-33477).

This update for rxvt-unicode fixes the following issues:

Update to 9.26

• ev_iouring.c was wrongly required during compilation, and wrongly not packaged.

Update to 9.25 (boo#1186174 CVE-2021-33477)

• for the 17.5th anniversary, and because many distributions seem to remove rxvt in favour of urxvt, this release resurrects rclock as urclock.
• add support for systemd socket-based activation - debian bug #917105, freebsd bug #234276.
• do not destruct perl on exit anymore: this might fail for a variety of reasons, and takes unneccessary time.
• remove any macros from urxvtperl manpage(s), should fix debian bug 858385.
• the old bg image resources are now provided by the background extension, and perl is thus required for bg image support. No configuration change is needed: urxvt autoloads the background ext if any bg image resource/option is present (for OSC sequences to work you need to enable it explicity). The old bg image resources are also now deprecated; users are encouraged to switch to the new bg image interface (see man urxvt-background).
• confirm-paste now checks for any ctlchars, not just newlines.
• searchable scrollback will now ignore bracketed paste mode sequences (prompted by Daniel Gröber's patch).
• drop ISO 2022 locale support. ISO 2022 encodings are not supported in POSIX locales and clash with vt100 charset emulation (the luit program can be used as a substitute).
• perl didn't parse rgba colours specified as an array correctly, only allowing 0 and 100% intensity for each component (this affected fill and tint).
• when iterating over resources, urxvt will now try to properly handle multipart resources (such as '*background.expr'), for the benefit of autoloading perl extensions.
• ESC G (query rxvt graphics mode) has been disabled due to security implications. The rxvt graphics mode was removed in rxvt-unicode 1.5, and no programs relying on being able to query the mode are known.
• work around API change breakage in perl 5.28, based on a patch by Roman Bogorodskiy.
• improved security: rob nation's (obsolete) graphics mode queries no longer reply with linefeed in secure/default mode.
• ISO 8613-3 direct colour SGR sequences (patch by Fengguang Wu).
• xterm focus reporting mode (patch by Daniel Hahler).
• xterm SGR mouse mode.
• implement DECRQM. Patch by Přemysl Eric Janouch.
• add missing color index parameter to OSC 4 response. Patch by Přemysl Eric Janouch.
• in some window managers, if smart resize was enabled, urxvt erroneously moved the window on font change - awesome bug #532, arch linux bug ##34807 (patch by Uli Schlachter).
• fix urxvtd crash when using a background expression.
• properly restore colors when using fading and reverse video is enabled while urxvt is focused and then disabled while it is not focused, or vice versa (patch by Daniel Hahler).
• fix high memory usage when an extension repeatedly hides and shows an overlay (reported by Marcel Lautenbach).
• expose priv_modes member and constants to perl extensions (patch by Rastislav Barlik).
• fix a whole slew of const sillyness, unfortunately forced upon us by ISO C++.
• update to libecb 0x00010006.
• disable all thread support in ecb.h as we presumably don't need it.
• slightly improve Makefile source dependencies.
• work around bugs in newer Pod::Xhtml versions (flags incorrect formatting codes in xhtml/html sections but does not interpret correct ones).
• New file: /usr/bin/urclock
• restore the -256color binaries

These are all security issues fixed in the rxvt-unicode-9.30-2.1 package on the GA media of openSUSE Tumbleweed.

It was discovered that rxvt-unicode incorrectly handled certain escape sequences. An attacker could possibly use this issue to execute arbitrary code if a user displayed specially crafted text in the terminal.