Bug#1051236: proftpd-core: SSH key exchanges fail unexpectedly with "unable to write X bytes of raw data"

[Jeremy Lecour]

Package: proftpd-core
Version: 1.3.8+dfsg-4+deb12u1
Severity: normal

Dear Maintainer,

After upgrading to Debian 12, my SFTP client stopped working with errors when connecting.

I've opened a GitHub issue and the problem has been solved.
https://github.com/proftpd/proftpd/issues/1694

It will even be backported to the 1.3.8 branch, so I hope that it might be available in an upcoming update in Debian 12.


Thanks.


-- System Information:
Debian Release: 12.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-11-cloud-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages proftpd-core depends on:
ii  adduser              3.134
ii  init-system-helpers  1.65.2
ii  libacl1              2.3.1-3
ii  libc6                2.36-9+deb12u1
ii  libcap2              1:2.66-4
ii  libcrypt1            1:4.4.33-2
ii  libhiredis0.14       0.14.1-3
ii  libidn2-0            2.3.3-1+b1
ii  libmemcached11       1.1.4-1
ii  libmemcachedutil2    1.1.4-1
ii  libncursesw6         6.4-4
ii  libpam-runtime       1.5.2-6
ii  libpam0g             1.5.2-6
ii  libpcre2-8-0         10.42-1
ii  libpcre2-posix3      10.42-1
ii  libssl3              3.0.9-1
ii  libtinfo6            6.4-4
ii  netbase              6.4
ii  ucf                  3.0043+nmu1
ii  zlib1g               1:1.2.13.dfsg-1

Versions of packages proftpd-core recommends:
pn  proftpd-doc  <none>

Versions of packages proftpd-core suggests:
pn  openbsd-inetd | inet-superserver  <none>
ii  openssl                           3.0.9-1
ii  proftpd-mod-crypto                1.3.8+dfsg-4+deb12u1
pn  proftpd-mod-geoip                 <none>
pn  proftpd-mod-ldap                  <none>
pn  proftpd-mod-mysql                 <none>
pn  proftpd-mod-odbc                  <none>
pn  proftpd-mod-pgsql                 <none>
pn  proftpd-mod-snmp                  <none>
pn  proftpd-mod-sqlite                <none>
ii  proftpd-mod-wrap                  1.3.8+dfsg-4+deb12u1

-- Configuration Files:
/etc/init.d/proftpd [Errno 13] Permission denied: '/etc/init.d/proftpd'

-- debconf-show failed