Your message dated Sat, 06 Nov 2021 12:34:26 +0000 with message-id <e1mjktu-000ile...@fasolo.debian.org> and subject line Bug#764027: fixed in openssh 1:8.7p1-1 has caused the Debian Bug report #764027, regarding [openssh-client] change default for CheckHostIP to no to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact ow...@bugs.debian.org immediately.) -- 764027: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=764027 Debian Bug Tracking System Contact ow...@bugs.debian.org with problems
--- Begin Message ---Package: openssh-client Version: 1:6.6p1-7 Severity: wishlist ssh_config(5) says about CheckHostIP: > This allows ssh to detect if a host key changed due to DNS spoofing. I think the situations where that detection might be helpful are quite rare. In the case of spoofing there will always be a message about the changed key for the hostname. On the other hand having it set to yes causes annoyance: * UserKnownHostsFile grows for each host with dynamic DNS * in networks with DHCP pools and dynamic DNS IPs get shuffled around and you'll often get false alarms * updating the hostkey of a multi-IPed server (perhaps a set of servers with RR DNS) by hand is hard because you have to find all the additional IP entries (with HashKnownHosts=on this might be even harder) * when using openssh-known-hosts with filters you filter for hostnames, not IPs, because you can't know the IPs an organization (such as debian) will receive next for hosting their services: + UserKnownHostsFile will get entries for each IP + an updated hostkey in the centrally managed known_hosts file will not be changed in UserKnownHostsFile leading to false alarms I guess most people don't and shouldn't have to care about the IP address(es) the server they connect to currently has, the connection between hostname and hostkey is enough. Therefore please set the default for CheckHostIP to no. Greetings Timo
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--- Begin Message ---Source: openssh Source-Version: 1:8.7p1-1 Done: Colin Watson <cjwat...@debian.org> We believe that the bug you reported is fixed in the latest version of openssh, which is due to be installed in the Debian FTP archive. A summary of the changes between this version and the previous one is attached. Thank you for reporting the bug, which will now be closed. If you have further comments please address them to 764...@bugs.debian.org, and the maintainer will reopen the bug report if appropriate. Debian distribution maintenance software pp. Colin Watson <cjwat...@debian.org> (supplier of updated openssh package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing ftpmas...@ftp-master.debian.org) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Sat, 06 Nov 2021 12:23:47 +0000 Source: openssh Architecture: source Version: 1:8.7p1-1 Distribution: unstable Urgency: medium Maintainer: Debian OpenSSH Maintainers <debian-ssh@lists.debian.org> Changed-By: Colin Watson <cjwat...@debian.org> Closes: 343267 609122 734386 762633 764027 875532 933665 995130 997030 997035 998069 Changes: openssh (1:8.7p1-1) unstable; urgency=medium . * debian/upstream/signing-key.asc: Update from upstream. * New upstream release (https://www.openssh.com/releasenotes.html#8.7p1): - scp(1): this release changes the behaviour of remote to remote copies (e.g. "scp host-a:/path host-b:") to transfer through the local host by default (closes: #734386, LP: #1462758). This was previously available via the -3 flag. A -R flag has been added to select the old behaviour. - ssh(1)/sshd(8): both the client and server are now using a stricter configuration file parser. - ssh(1): when using SSHFP DNS records for host key verification, ssh(1) will verify all matching records instead of just those with the specific signature type requested. - ssh-keygen(1): when generating a FIDO key and specifying an explicit attestation challenge (using -Ochallenge), the challenge will now be hashed by the builtin security key middleware. - sshd(8): environment="..." directives in authorized_keys files are now first-match-wins and limited to 1024 discrete environment variable names. - scp(1): experimental support for transfers using the SFTP protocol as a replacement for the venerable SCP/RCP protocol that it has traditionally used. SFTP offers more predictable filename handling and does not require expansion of glob(3) patterns via the shell on the remote side. SFTP support may be enabled via a temporary scp -s flag. It is intended for SFTP to become the default transfer mode in the near future, at which time the -s flag will be removed. The -O flag exists to force use of the original SCP/RCP protocol for cases where SFTP may be unavailable or incompatible. - sftp-server(8): add a protocol extension to support expansion of ~/ and ~user/ prefixed paths. This was added to support these paths when used by scp(1) while in SFTP mode. - ssh(1): add a ForkAfterAuthentication ssh_config(5) counterpart to the ssh(1) -f flag. GHPR231 - ssh(1): add a StdinNull directive to ssh_config(5) that allows the config file to do the same thing as -n does on the ssh(1) command- line. GHPR231 - ssh(1): add a SessionType directive to ssh_config, allowing the configuration file to offer equivalent control to the -N (no session) and -s (subsystem) command-line flags (closes: #609122). - ssh-keygen(1): allowed signers files used by ssh-keygen(1) signatures now support listing key validity intervals alongside they key, and ssh-keygen(1) can optionally check during signature verification whether a specified time falls inside this interval. This feature is intended for use by git to support signing and verifying objects using ssh keys. - ssh-keygen(8): support printing of the full public key in a sshsig signature via a -Oprint-pubkey flag. - ssh(1)/sshd(8): start time-based re-keying exactly on schedule in the client and server mainloops. Previously the re-key timeout could expire but re-keying would not start until a packet was sent or received, causing a spin in select() if the connection was quiescent. - ssh-keygen(1): avoid Y2038 problem in printing certificate validity lifetimes. Dates past 2^31-1 seconds since epoch were displayed incorrectly on some platforms. - scp(1): allow spaces to appear in usernames for local to remote and scp -3 remote to remote copies. - ssh(1)/sshd(8): remove references to ChallengeResponseAuthentication in favour of KbdInteractiveAuthentication. The former is what was in SSHv1, the latter is what is in SSHv2 (RFC4256) and they were treated as somewhat but not entirely equivalent. We retain the old name as a deprecated alias so configuration files continue to work as well as a reference in the man page for people looking for it. - ssh(1)/ssh-add(1)/ssh-keygen(1): fix decoding of X.509 subject name when extracting a key from a PKCS#11 certificate. - ssh(1): restore blocking status on stdio fds before close. ssh(1) needs file descriptors in non-blocking mode to operate but it was not restoring the original state on exit. This could cause problems with fds shared with other programs via the shell. - ssh(1)/sshd(8): switch both client and server mainloops from select(3) to pselect(3). Avoids race conditions where a signal may arrive immediately before select(3) and not be processed until an event fires. - ssh(1): sessions started with ControlPersist were incorrectly executing a shell when the -N (no shell) option was specified (closes: #762633). - ssh(1): check if IPQoS or TunnelDevice are already set before overriding. Prevents values in config files from overriding values supplied on the command line. - ssh(1): fix debug message when finding a private key to match a certificate being attempted for user authentication. Previously it would print the certificate's path, whereas it was supposed to be showing the private key's path. - sshd(8): match host certificates against host public keys, not private keys. Allows use of certificates with private keys held in a ssh-agent. - ssh(1): add a workaround for a bug in OpenSSH 7.4 sshd(8), which allows RSA/SHA2 signatures for public key authentication but fails to advertise this correctly via SSH2_MSG_EXT_INFO. This causes clients of these server to incorrectly match PubkeyAcceptedAlgorithms and potentially refuse to offer valid keys. - sftp(1)/scp(1): degrade gracefully if a sftp-server offers the lim...@openssh.com extension but fails when the client tries to invoke it. - ssh(1): allow ssh_config SetEnv to override $TERM, which is otherwise handled specially by the protocol. Useful in ~/.ssh/config to set TERM to something generic (e.g. "xterm" instead of "xterm-256color") for destinations that lack terminfo entries. - sftp-server(8): the lim...@openssh.com extension was incorrectly marked as an operation that writes to the filesystem, which made it unavailable in sftp-server read-only mode. - ssh(1): fix SEGV in UpdateHostkeys debug() message, triggered when the update removed more host keys than remain present. - Many manual page fixes. - sshd(8): handle GIDs > 2^31 in getgrouplist. When compiled in 32bit mode, the getgrouplist implementation may fail for GIDs greater than LONG_MAX. - ssh(1): xstrdup environment variable used by ForwardAgent. - sshd(8): don't sigdie() in signal handler in privsep child process; this can end up causing sandbox violations. * New upstream release (https://www.openssh.com/releasenotes.html#8.6p1): - sftp-server(8): add a new lim...@openssh.com protocol extension that allows a client to discover various server limits, including maximum packet size and maximum read/write length. - sftp(1): use the new lim...@openssh.com extension (when available) to select better transfer lengths in the client. - sshd(8): Add ModuliFile keyword to sshd_config to specify the location of the "moduli" file containing the groups for DH-GEX. - ssh_config(5), sshd_config(5): sync CASignatureAlgorithms lists in manual pages with the current default. - ssh(1): ensure that pkcs11_del_provider() is called before exit. - ssh(1), sshd(8): fix problems in string->argv conversion. Multiple backslashes were not being dequoted correctly and quoted space in the middle of a string was being incorrectly split. - ssh(1): return non-zero exit status when killed by signal. - sftp-server(8): increase maximum SSH2_FXP_READ to match the maximum packet size. Also handle zero-length reads that are not explicitly banned by the spec. - sshd(8): don't mistakenly exit on transient read errors on the network socket (e.g. EINTR, EAGAIN). - Create a dedicated contrib/gnome-ssk-askpass3.c source instead of building it from the same file as used for GNOME2. Use the GNOME3 gdk_seat_grab() to manage keyboard/mouse/server grabs for better compatibility with Wayland. - sshd(8): soft-disallow the fstatat64 syscall in the Linux seccomp-bpf sandbox. * New upstream release (https://www.openssh.com/releasenotes.html#8.5p1): - ssh(1), sshd(8): change the first-preference signature algorithm from ECDSA to ED25519. - ssh(1), sshd(8): set the TOS/DSCP specified in the configuration for interactive use prior to TCP connect. - ssh(1), sshd(8): remove the pre-standardization cipher rijndael-...@lysator.liu.se. - ssh(1), sshd(8): update/replace the experimental post-quantum hybrid key exchange method based on Streamlined NTRU Prime coupled with X25519. - ssh(1): disable CheckHostIP by default. It provides insignificant benefits while making key rotation significantly more difficult, especially for hosts behind IP-based load-balancers (closes: #764027). - ssh(1): enable UpdateHostkeys by default subject to some conservative preconditions (closes: #875532): + The key was matched in the UserKnownHostsFile (and not in the GlobalKnownHostsFile). + The same key does not exist under another name. + A certificate host key is not in use. + known_hosts contains no matching wildcard hostname pattern. + VerifyHostKeyDNS is not enabled. + The default UserKnownHostsFile is in use. We expect some of these conditions will be modified or relaxed in future. - ssh(1), sshd(8): add a new LogVerbose configuration directive that allows forcing maximum debug logging by file/function/line pattern-lists. - ssh(1): when prompting the user to accept a new hostkey, display any other host names/addresses already associated with the key. - ssh(1): allow UserKnownHostsFile=none to indicate that no known_hosts file should be used to identify host keys. - ssh(1): add a ssh_config KnownHostsCommand option that allows the client to obtain known_hosts data from a command in addition to the usual files. - ssh(1): add a ssh_config PermitRemoteOpen option that allows the client to restrict the destination when RemoteForward is used with SOCKS. - ssh(1): for FIDO keys, if a signature operation fails with a "incorrect PIN" reason and no PIN was initially requested from the user, then request a PIN and retry the operation. This supports some biometric devices that fall back to requiring PIN when reading of the biometric failed, and devices that require PINs for all hosted credentials. - sshd(8): implement client address-based rate-limiting via new sshd_config(5) PerSourceMaxStartups and PerSourceNetBlockSize directives that provide more fine-grained control on a per-origin address basis than the global MaxStartups limit. - ssh(1): Prefix keyboard interactive prompts with "(user@host)" to make it easier to determine which connection they are associated with in cases like scp -3, ProxyJump, etc. (closes: #343267). - sshd(8): fix sshd_config SetEnv directives located inside Match blocks. - ssh(1): when requesting a FIDO token touch on stderr, inform the user once the touch has been recorded. - ssh(1): prevent integer overflow when ridiculously large ConnectTimeout values are specified, capping the effective value (for most platforms) at 24 days. - ssh(1): consider the ECDSA key subtype when ordering host key algorithms in the client. - ssh(1), sshd(8): rename the PubkeyAcceptedKeyTypes keyword to PubkeyAcceptedAlgorithms. The previous name incorrectly suggested that it control allowed key algorithms, when this option actually specifies the signature algorithms that are accepted. The previous name remains available as an alias (closes: #933665). - ssh(1), sshd(8): similarly, rename HostbasedKeyTypes (ssh) and HostbasedAcceptedKeyTypes (sshd) to HostbasedAcceptedAlgorithms. - sftp-server(8): add missing lsets...@openssh.com documentation and advertisement in the server's SSH2_FXP_VERSION hello packet. - ssh(1), sshd(8): more strictly enforce KEX state-machine by banning packet types once they are received. Fixes memleak caused by duplicate SSH2_MSG_KEX_DH_GEX_REQUEST. - sftp(1): allow the full range of UIDs/GIDs for chown/chgrp on 32bit platforms instead of being limited by LONG_MAX. - Minor man page fixes (capitalization, commas, etc.) - sftp(1): when doing an sftp recursive upload or download of a read-only directory, ensure that the directory is created with write and execute permissions in the interim so that the transfer can actually complete, then set the directory permission as the final step. - ssh-keygen(1): document the -Z, check the validity of its argument earlier and provide a better error message if it's not correct. - ssh(1): ignore comments at the end of config lines in ssh_config, similar to what we already do for sshd_config. - sshd_config(5): mention that DisableForwarding is valid in a sshd_config Match block. - sftp(1): fix incorrect sorting of "ls -ltr" under some circumstances. - ssh(1), sshd(8): fix potential integer truncation of (unlikely) timeout values. - ssh(1): make hostbased authentication send the signature algorithm in its SSH2_MSG_USERAUTH_REQUEST packets instead of the key type. This make HostbasedAcceptedAlgorithms do what it is supposed to - filter on signature algorithm and not key type. - sshd(8): add a number of platform-specific syscalls to the Linux seccomp-bpf sandbox. - sshd(8): remove debug message from sigchld handler that could cause deadlock on some platforms. - Sync contrib/ssh-copy-id with upstream. * Remove OpenBSD-specific rdomain references from sshd_config(5) (closes: #998069). * Define MAXHOSTNAMELEN on GNU/Hurd (thanks, Svante Signell; closes: #997030). * Build-depend on libelogind-dev as an alternative to libsystemd-dev on Linux (thanks, Svante Signell; closes: #997035). * Backport from upstream: - CVE-2021-41617 (closes: #995130): sshd(8) from OpenSSH 6.2 through 8.7 failed to correctly initialise supplemental groups when executing an AuthorizedKeysCommand or AuthorizedPrincipalsCommand, where a AuthorizedKeysCommandUser or AuthorizedPrincipalsCommandUser directive has been set to run the command as a different user. Instead these commands would inherit the groups that sshd(8) was started with. * Configure with ac_cv_func_closefrom=no to avoid an incompatibility with glibc 2.34's fallback_closefrom function (thanks, William 'jawn-smith' Wilson; LP: #1944621). 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