CVE-2016-10708

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

• CVE-2016-10708: fix crash in packet handling code by moving inbound NEWKEYS handling to kex layer
• CVE-2016-10012: abandon the fix due to compression mode issues

• CVE-2016-10708: fix crash in packet handling code by moving inbound NEWKEYS handling to kex layer
• CVE-2016-10012: abandon the fix due to compression mode issues

This update for openssh fixes the following issues:

Security issue fixed:

• CVE-2016-10708: Prevent DoS due to crashes caused by out-of-sequence NEWKEYS message (bsc#1076957).

This update for openssh fixes the following issues:

Security issues fixed:

• CVE-2016-10012: Fix pre-auth compression checks that could be optimized away (bsc#1016370).
• CVE-2016-10708: Fix remote denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYSmessage (bsc#1076957).
• CVE-2017-15906: Fix r/o sftp-server zero byte file creation (bsc#1065000).
• CVE-2008-1483: Fix accidental re-introduction of CVE-2008-1483 (bsc#1069509).

Bug fixes:

• bsc#1017099: Match conditions with uppercase hostnames fail (bsc#1017099)
• bsc#1053972: supportedKeyExchanges diffie-hellman-group1-sha1 is duplicated (bsc#1053972)
• bsc#1023275: Messages suppressed after upgrade from SLES 11 SP3 to SP4 (bsc#1023275)

This update for openssh fixes the following issues:

Security issue fixed:

• CVE-2016-10708: Prevent DoS due to crashes caused by out-of-sequence NEWKEYS message (bsc#1076957).

This update for openssh fixes the following issues:

Security issue fixed:

• CVE-2016-10708: Prevent DoS due to crashes caused by out-of-sequence NEWKEYS message (bsc#1076957).

This update for openssh provides the following fixes:

Security issues fixed:

• CVE-2017-15906: Stricter checking of operations in read-only mode in sftp server (bsc#1065000).
• CVE-2016-10012: Remove pre-auth compression support from the server to prevent possible cryptographic attacks (bsc#1016370).
• CVE-2008-1483: Refine handling of sockets for X11 forwarding to remove reintroduced CVE-2008-1483 (bsc#1069509).
• CVE-2016-10708: Prevent DoS due to crashes caused by out-of-sequence NEWKEYS message (bsc#1076957).

Bug fixes:

• bsc#1017099: Enable case-insensitive hostname matching.
• bsc#1023275: Add a new switch for printing diagnostic messages in sftp client's batch mode.
• bsc#1048367: systemd integration to work around various race conditions.
• bsc#1053972: Remove duplicate KEX method.
• bsc#1092582: Add missing piece of systemd integration.
• Remove the limit on the amount of tasks sshd can run.

This update for openssh-openssl1 fixes the following issues:

These security issues were fixed:

• CVE-2016-10708: Prevent NULL pointer dereference via an out-of-sequence NEWKEYS message allowed remote attackers to cause a denial of service (bsc#1076957).
• CVE-2017-15906: The process_open function did not properly prevent write operations in readonly mode, which allowed attackers to create zero-length files (bsc#1065000).
• CVE-2016-10012: The shared memory manager (associated with pre-authentication compression) did not ensure that a bounds check is enforced by all compilers, which might have allowed local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures (bsc#1016370).
• CVE-2008-1483: Prevent local users from hijacking forwarded X connections by causing ssh to set DISPLAY to :10, even when another process is listening on the associated port. This problem was reontroduced by another patch and was previously fixed by another update (bsc#1069509).

These non-security issues were fixed:

• Remove duplicate KEX method (bsc#1053972)
• New switch for printing diagnostic messages in sftp client's batch mode (bsc#1023275)
• Enable case-insensitive hostname matching (bsc#1017099)

This update for openssh fixes the following issues:

Security issues fixed:

• CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability. (bsc#1106163)
• CVE-2017-15906: The process_open function in sftp-server.c in OpenSSH did not properly prevent write operations in readonly mode, which allowed attackers to create zero-length files. (bsc#1065000, bsc#1106726)
• CVE-2016-10708: sshd allowed remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c. (bsc#1076957)
• CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010)
• CVE-2016-10012: Removed pre-auth compression support from the server to prevent possible cryptographic attacks. (bsc#1016370)

Bugs fixed:

• Fixed failing 'AuthorizedKeysCommand' within a 'Match User' block in sshd_config (bsc#1105180)

Robert Swiecki discovered that OpenSSH incorrectly handled certain messages. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10708)

It was discovered that OpenSSH incorrectly handled certain requests. An attacker could possibly use this issue to access sensitive information. (CVE-2018-15473)