CVE-2015-1782

Updated libssh2 packages fix security vulnerability:

Mariusz Ziulek reported that libssh2, a SSH2 client-side library, was reading and using the SSH_MSG_KEXINIT packet without doing sufficient range checks when negotiating a new SSH session with a remote server. A malicious attacker could man in the middle a real server and cause a client using the libssh2 library to crash (denial of service) or otherwise read and use unintended memory areas in this process (CVE-2015-1782).

These are all security issues fixed in the libssh2-1-1.7.0-1.5 package on the GA media of openSUSE Tumbleweed.

This update for libssh2_org fixes the following issues:

libssh2_org was upgraded to version 1.11.0 in SUSE Linux Enterprise Server 12 SP5 (jsc#PED-5721)

Version update to 1.11.0:

• Enhancements and bugfixes:

  • Adds support for encrypt-then-mac (ETM) MACs
  • Adds support for AES-GCM crypto protocols
  • Adds support for sk-ecdsa-sha2-nistp256 and sk-ssh-ed25519 keys
  • Adds support for RSA certificate authentication
  • Adds FIDO support with *_sk() functions
  • Adds RSA-SHA2 key upgrading to OpenSSL, WinCNG, mbedTLS, OS400 backends
  • Adds Agent Forwarding and libssh2_agent_sign()
  • Adds support for Channel Signal message libssh2_channel_signal_ex()
  • Adds support to get the user auth banner message libssh2_userauth_banner()
  • Adds LIBSSH2_NO_{MD5, HMAC_RIPEMD, DSA, RSA, RSA_SHA1, ECDSA, ED25519, AES_CBC, AES_CTR, BLOWFISH, RC4, CAST, 3DES} options
  • Adds direct stream UNIX sockets with libssh2_channel_direct_streamlocal_ex()
  • Adds wolfSSL support to CMake file
  • Adds mbedTLS 3.x support
  • Adds LibreSSL 3.5 support
  • Adds support for CMake 'unity' builds
  • Adds CMake support for building shared and static libs in a single pass
  • Adds symbol hiding support to CMake
  • Adds support for libssh2.rc for all build tools
  • Adds .zip, .tar.xz and .tar.bz2 release tarballs
  • Enables ed25519 key support for LibreSSL 3.7.0 or higher
  • Improves OpenSSL 1.1 and 3 compatibility
  • Now requires OpenSSL 1.0.2 or newer
  • Now requires CMake 3.1 or newer
  • SFTP: Adds libssh2_sftp_open_ex_r() and libssh2_sftp_open_r() extended APIs
  • SFTP: No longer has a packet limit when reading a directory
  • SFTP: now parses attribute extensions if they exist
  • SFTP: no longer will busy loop if SFTP fails to initialize
  • SFTP: now clear various errors as expected
  • SFTP: no longer skips files if the line buffer is too small
  • SCP: add option to not quote paths
  • SCP: Enables 64-bit offset support unconditionally
  • Now skips leading \r and \n characters in banner_receive()
  • Enables secure memory zeroing with all build tools on all platforms
  • No longer logs SSH_MSG_REQUEST_FAILURE packets from keepalive
  • Speed up base64 encoding by 7x
  • Assert if there is an attempt to write a value that is too large
  • WinCNG: fix memory leak in _libssh2_dh_secret()
  • Added protection against possible null pointer dereferences
  • Agent now handles overly large comment lengths
  • Now ensure KEX replies don't include extra bytes
  • Fixed possible buffer overflow when receiving SSH_MSG_USERAUTH_BANNER
  • Fixed possible buffer overflow in keyboard interactive code path
  • Fixed overlapping memcpy()
  • Fixed DLL import name
  • Renamed local RANDOM_PADDING macro to avoid unexpected define on Windows
  • Support for building with gcc versions older than 8
  • Improvements to CMake, Makefile, NMakefile, GNUmakefile, autoreconf files
  • Restores ANSI C89 compliance
  • Enabled new compiler warnings and fixed/silenced them
  • Improved error messages
  • Now uses CIFuzz
  • Numerous minor code improvements
  • Improvements to CI builds
  • Improvements to unit tests
  • Improvements to doc files
  • Improvements to example files
  • Removed 'old gex' build option
  • Removed no-encryption/no-mac builds
  • Removed support for NetWare and Watcom wmake build files

Version update to 1.10.0:

• Enhancements and bugfixes:

  • support ECDSA certificate authentication
  • fix detailed _libssh2_error being overwritten by generic errors
  • unified error handling
  • fix _libssh2_random() silently discarding errors
  • don't error if using keys without RSA
  • avoid OpenSSL latent error in FIPS mode
  • fix EVP_Cipher interface change in openssl 3
  • fix potential overwrite of buffer when reading stdout of command
  • use string_buf in ecdh_sha2_nistp() to avoid attempting…

The ssh client library libssh2_org was updated to fix a security issue.

CVE-2015-1782: A malicious server could send a crafted SSH_MSG_KEXINIT packet, that could lead to a buffer overread and to a crash of the libssh2_org using application.

The ssh client library libssh2_org was updated to fix a security issue:

* CVE-2015-1782: A malicious server could send a crafted
  SSH_MSG_KEXINIT packet, that could lead to a buffer overread and to a
  crash of the application using libssh2_org.

Security Issues:

* CVE-2015-1782
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1782>

The kex_agree_methods function in libssh2 before 1.5.0 allows remote servers to cause a denial of service (crash) or have other unspecified impact via crafted length values in an SSH_MSG_KEXINIT packet.