Openbsd OpenSSH vulnerabilities

CVE-2021-36368 [LOW] CWE-287 CVE-2021-36368: An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with a An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to

CVE-2021-41617 [HIGH] CVE-2021-41617: sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows privilege escalation because supplemental groups are not initialized as expected. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration spec

CVE-2016-20012 [MEDIUM] CVE-2016-20012: OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of user OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerab

CVE-2021-28041 [HIGH] CWE-415 CVE-2021-28041: ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenario ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstrained agent-socket access on a legacy operating system, or the forwarding of an agent to an attacker-controlled host.

CVE-2020-15778 [HIGH] CWE-78 CVE-2020-15778: scp in OpenSSH through 8.3p1 allows command injection in the scp.c toremote function, as demonstrate scp in OpenSSH through 8.3p1 allows command injection in the scp.c toremote function, as demonstrated by backtick characters in the destination argument. NOTE: the vendor reportedly has stated that they intentionally omit validation of "anomalous argument transfers" because that could "stand a great chance of breaking existing workflows."

CVE-2020-14145 [MEDIUM] CWE-203 CVE-2020-14145: The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information l The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.

CVE-2020-12062 [HIGH] CWE-20 CVE-2020-12062: The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes syst The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arbitrary files in the client's download directory by creating a crafted subdirectory anywhere on the remote server. The victim must use the command scp -rp to

CVE-2019-16905 [HIGH] CWE-190 CVE-2019-16905: OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-a OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered exp

CVE-2019-6109 [MEDIUM] CWE-116 CVE-2019-6109: An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.

CVE-2019-6111 [MEDIUM] CWE-22 CVE-2019-6111: An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, t An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker

CVE-2019-6110 [MEDIUM] CWE-838 CVE-2019-6110: In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-The-Middle attacker) can manipulate the client output, for example to use ANSI control codes to hide additional files being transferred.

CVE-2018-20685 [MEDIUM] CWE-863 CVE-2018-20685: In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrict In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.

CVE-2018-15919 [MEDIUM] CWE-200 CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attacker Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'

CVE-2018-15473 [MEDIUM] CWE-362 CVE-2018-15473: OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an OpenSSH through 7.7 is prone to a user enumeration 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.

CVE-2016-10708 [HIGH] CWE-476 CVE-2016-10708: sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer derefe 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-2017-15906 [MEDIUM] CWE-732 CVE-2017-15906: The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write ope The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.

CVE-2016-1908 [CRITICAL] CWE-287 CVE-2016-1908: The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding an The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SEC

CVE-2016-6210 [MEDIUM] CWE-200 CVE-2016-6210: sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.

CVE-2016-10009 [HIGH] CWE-426 CVE-2016-10009: Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4 allows remote Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4 allows remote attackers to execute arbitrary local PKCS#11 modules by leveraging control over a forwarded agent-socket.

CVE-2016-10012 [HIGH] CWE-119 CVE-2016-10012: The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.