openssh (1:8.1p1-1) unstable; urgency=medium
* New upstream release (https://www.openssh.com/txt/release-8.1):
- ssh(1), sshd(8), ssh-agent(1): Add protection for private keys at rest
in RAM against speculation and memory side-channel attacks like
Spectre, Meltdown and Rambleed. This release encrypts private keys
when they are not in use with a symmetric key that is derived from a
relatively large "prekey" consisting of random data (currently 16KB).
- ssh(1): Allow %n to be expanded in ProxyCommand strings.
- ssh(1), sshd(8): Allow prepending a list of algorithms to the default
set by starting the list with the '^' character, e.g.
"HostKeyAlgorithms ^ssh-ed25519".
- ssh-keygen(1): Add an experimental lightweight signature and
verification ability. Signatures may be made using regular ssh keys
held on disk or stored in a ssh-agent and verified against an
authorized_keys-like list of allowed keys. Signatures embed a
namespace that prevents confusion and attacks between different usage
domains (e.g. files vs email).
- ssh-keygen(1): Print key comment when extracting public key from a
private key.
- ssh-keygen(1): Accept the verbose flag when searching for host keys in
known hosts (i.e. "ssh-keygen -vF host") to print the matching host's
random-art signature too.
- All: Support PKCS8 as an optional format for storage of private keys
to disk. The OpenSSH native key format remains the default, but PKCS8
is a superior format to PEM if interoperability with non-OpenSSH
software is required, as it may use a less insecure key derivation
function than PEM's.
- ssh(1): If a PKCS#11 token returns no keys then try to login and
refetch them.
- ssh(1): Produce a useful error message if the user's shell is set
incorrectly during "match exec" processing.
- sftp(1): Allow the maximum uint32 value for the argument passed to -b
which allows better error messages from later validation.
- ssh-keyscan(1): Include SHA2-variant RSA key algorithms in KEX
proposal; allows ssh-keyscan to harvest keys from servers that disable
old SHA1 ssh-rsa.
- sftp(1): Print explicit "not modified" message if a file was requested
for resumed download but was considered already complete.
- sftp(1): Fix a typo and make <esc><right> move right to the closest
end of a word just like <esc><left> moves left to the closest
beginning of a word.
- sshd(8): Cap the number of permitopen/permitlisten directives allowed
to appear on a single authorized_keys line.
- All: Fix a number of memory leaks (one-off or on exit paths).
- ssh(1), sshd(8): Check for convtime() refusing to accept times that
resolve to LONG_MAX.
- ssh(1): Slightly more instructive error message when the user
specifies multiple -J options on the command-line (closes: #929669).
- ssh-agent(1): Process agent requests for RSA certificate private keys
using correct signature algorithm when requested.
- sftp(1): Check for user@host when parsing sftp target. This allows
user@[1.2.3.4] to work without a path.
- sshd(8): Enlarge format buffer size for certificate serial number so
the log message can record any 64-bit integer without truncation.
- sshd(8): For PermitOpen violations add the remote host and port to be
able to more easily ascertain the source of the request. Add the same
logging for PermitListen violations which were not previously logged
at all.
- scp(1), sftp(1): Use the correct POSIX format style for left
justification for the transfer progress meter.
- sshd(8): When examining a configuration using sshd -T, assume any
attribute not provided by -C does not match, which allows it to work
when sshd_config contains a Match directive with or without -C.
- ssh(1), ssh-keygen(1): Downgrade PKCS#11 "provider returned no slots"
warning from log level error to debug. This is common when attempting
to enumerate keys on smartcard readers with no cards plugged in.
- ssh(1), ssh-keygen(1): Do not unconditionally log in to PKCS#11
tokens. Avoids spurious PIN prompts for keys not selected for
authentication in ssh(1) and when listing public keys available in a
token using ssh-keygen(1).
- ssh(1), sshd(8): Fix typo that prevented detection of Linux VRF.
- sshd(8): In the Linux seccomp-bpf sandbox, allow mprotect(2) with
PROT_(READ|WRITE|NONE) only. This syscall is used by some hardened
heap allocators.
- sshd(8): In the Linux seccomp-bpf sandbox, allow the s390-specific
ioctl for ECC hardware support.
* Re-enable hardening on hppa, since the corresponding GCC bug is
apparently fixed.
-- Colin Watson <email address hidden> Thu, 10 Oct 2019 10:23:19 +0100