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Openbsd » Openssh » * * * * : Security Vulnerabilities

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# CVE ID CWE ID # of Exploits Vulnerability Type(s) Publish Date Update Date Score Gained Access Level Access Complexity Authentication Conf. Integ. Avail.
1 CVE-2021-41617 269 2021-09-26 2022-04-20
4.4
None Local Medium Not required Partial Partial Partial
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 specifies running the command as a different user.
2 CVE-2021-36368 287 Bypass 2022-03-13 2022-07-01
2.6
None Remote High Not required Partial None None
** DISPUTED ** 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 that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed."
3 CVE-2021-28041 415 2021-03-05 2022-05-20
4.6
None Remote High ??? Partial Partial Partial
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.
4 CVE-2020-15778 78 2020-07-24 2021-06-22
6.8
None Remote Medium Not required Partial Partial Partial
** DISPUTED ** 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."
5 CVE-2020-14145 203 +Info 2020-06-29 2022-04-28
4.3
None Remote Medium Not required Partial None None
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.
6 CVE-2019-16905 190 Exec Code Overflow Mem. Corr. 2019-10-09 2022-03-31
4.4
None Local Medium Not required Partial Partial Partial
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 experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.
7 CVE-2019-6111 22 Dir. Trav. 2019-01-31 2020-08-24
5.8
None Remote Medium Not required None Partial Partial
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) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).
8 CVE-2019-6110 838 2019-01-31 2020-08-24
4.0
None Remote High Not required Partial Partial None
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.
9 CVE-2019-6109 116 2019-01-31 2020-08-24
4.0
None Remote High Not required Partial Partial None
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.
10 CVE-2018-20685 863 Bypass 2019-01-10 2020-08-24
2.6
None Remote High Not required None Partial None
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.
11 CVE-2018-15919 200 +Info 2018-08-28 2019-03-07
5.0
None Remote Low Not required Partial None None
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.'
12 CVE-2018-15473 362 2018-08-17 2020-08-24
5.0
None Remote Low Not required Partial None None
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.
13 CVE-2016-20012 2021-09-15 2022-04-18
4.3
None Remote Medium Not required Partial None None
** DISPUTED ** 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 vulnerability for this product.
14 CVE-2016-10708 476 DoS 2018-01-21 2021-09-14
5.0
None Remote Low Not required None None Partial
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.
15 CVE-2016-10012 119 Overflow +Priv 2017-01-05 2018-09-11
7.2
None Local Low Not required Complete Complete Complete
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.
16 CVE-2016-10011 320 +Info 2017-01-05 2021-09-14
2.1
None Local Low Not required Partial None None
authfile.c in sshd in OpenSSH before 7.4 does not properly consider the effects of realloc on buffer contents, which might allow local users to obtain sensitive private-key information by leveraging access to a privilege-separated child process.
17 CVE-2016-10010 264 +Priv 2017-01-05 2018-06-01
6.9
None Local Medium Not required Complete Complete Complete
sshd in OpenSSH before 7.4, when privilege separation is not used, creates forwarded Unix-domain sockets as root, which might allow local users to gain privileges via unspecified vectors, related to serverloop.c.
18 CVE-2016-10009 426 2017-01-05 2018-09-11
7.5
None Remote Low Not required Partial Partial Partial
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.
19 CVE-2015-6564 264 +Priv 2015-08-24 2019-03-26
6.9
None Local Medium Not required Complete Complete Complete
Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.
20 CVE-2015-6563 20 2015-08-24 2019-03-26
1.9
None Local Medium Not required None Partial None
The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.
21 CVE-2015-5600 264 DoS 2015-08-03 2021-11-17
8.5
None Remote Low Not required Partial None Complete
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
22 CVE-2015-5352 264 Bypass 2015-08-03 2018-10-24
4.3
None Remote Medium Not required None Partial None
The x11_open_helper function in channels.c in ssh in OpenSSH before 6.9, when ForwardX11Trusted mode is not used, lacks a check of the refusal deadline for X connections, which makes it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window.
23 CVE-2014-2653 20 2014-03-27 2017-01-07
5.8
None Remote Medium Not required Partial Partial None
The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate.
24 CVE-2014-2532 264 Bypass 2014-03-18 2018-07-19
5.8
None Remote Medium Not required Partial Partial None
sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character.
25 CVE-2014-1692 119 DoS Overflow Mem. Corr. 2014-01-29 2020-02-04
7.5
None Remote Low Not required Partial Partial Partial
The hash_buffer function in schnorr.c in OpenSSH through 6.4, when Makefile.inc is modified to enable the J-PAKE protocol, does not initialize certain data structures, which might allow remote attackers to cause a denial of service (memory corruption) or have unspecified other impact via vectors that trigger an error condition.
26 CVE-2012-0814 255 +Info 2012-01-27 2017-08-29
3.5
None Remote Medium ??? Partial None None
The auth_parse_options function in auth-options.c in sshd in OpenSSH before 5.7 provides debug messages containing authorized_keys command options, which allows remote authenticated users to obtain potentially sensitive information by reading these messages, as demonstrated by the shared user account required by Gitolite. NOTE: this can cross privilege boundaries because a user account may intentionally have no shell or filesystem access, and therefore may have no supported way to read an authorized_keys file in its own home directory.
27 CVE-2011-5000 189 DoS 2012-04-05 2012-07-22
3.5
None Remote Medium ??? None None Partial
The ssh_gssapi_parse_ename function in gss-serv.c in OpenSSH 5.8 and earlier, when gssapi-with-mic authentication is enabled, allows remote authenticated users to cause a denial of service (memory consumption) via a large value in a certain length field. NOTE: there may be limited scenarios in which this issue is relevant.
28 CVE-2011-4327 200 +Info 2014-02-03 2014-02-21
2.1
None Local Low Not required Partial None None
ssh-keysign.c in ssh-keysign in OpenSSH before 5.8p2 on certain platforms executes ssh-rand-helper with unintended open file descriptors, which allows local users to obtain sensitive key information via the ptrace system call.
29 CVE-2010-5107 DoS 2013-03-07 2017-09-19
5.0
None Remote Low Not required None None Partial
The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, which makes it easier for remote attackers to cause a denial of service (connection-slot exhaustion) by periodically making many new TCP connections.
30 CVE-2010-4478 287 Bypass 2010-12-06 2017-09-19
7.5
None Remote Low Not required Partial Partial Partial
OpenSSH 5.6 and earlier, when J-PAKE is enabled, does not properly validate the public parameters in the J-PAKE protocol, which allows remote attackers to bypass the need for knowledge of the shared secret, and successfully authenticate, by sending crafted values in each round of the protocol, a related issue to CVE-2010-4252.
31 CVE-2008-3259 200 +Info 2008-07-22 2017-08-08
1.2
None Local High Not required Partial None None
OpenSSH before 5.1 sets the SO_REUSEADDR socket option when the X11UseLocalhost configuration setting is disabled, which allows local users on some platforms to hijack the X11 forwarding port via a bind to a single IP address, as demonstrated on the HP-UX platform.
32 CVE-2007-4752 20 +Priv 2007-09-12 2018-10-15
7.5
None Remote Low Not required Partial Partial Partial
ssh in OpenSSH before 4.7 does not properly handle when an untrusted cookie cannot be created and uses a trusted X11 cookie instead, which allows attackers to violate intended policy and gain privileges by causing an X client to be treated as trusted.
33 CVE-2007-2768 200 +Info 2007-05-21 2021-04-01
4.3
None Remote Medium Not required Partial None None
OpenSSH, when using OPIE (One-Time Passwords in Everything) for PAM, allows remote attackers to determine the existence of certain user accounts, which displays a different response if the user account exists and is configured to use one-time passwords (OTP), a similar issue to CVE-2007-2243.
34 CVE-2006-5794 Bypass 2006-11-08 2018-10-17
7.5
None Remote Low Not required Partial Partial Partial
Unspecified vulnerability in the sshd Privilege Separation Monitor in OpenSSH before 4.5 causes weaker verification that authentication has been successful, which might allow attackers to bypass authentication. NOTE: as of 20061108, it is believed that this issue is only exploitable by leveraging vulnerabilities in the unprivileged process, which are not known to exist.
35 CVE-2004-1653 2004-08-31 2017-07-11
6.4
None Remote Low Not required Partial Partial None
The default configuration for OpenSSH enables AllowTcpForwarding, which could allow remote authenticated users to perform a port bounce, when configured with an anonymous access program such as AnonCVS.
36 CVE-2003-0695 DoS Exec Code 2003-10-06 2018-05-03
7.5
None Remote Low Not required Partial Partial Partial
Multiple "buffer management errors" in OpenSSH before 3.7.1 may allow attackers to cause a denial of service or execute arbitrary code using (1) buffer_init in buffer.c, (2) buffer_free in buffer.c, or (3) a separate function in channels.c, a different vulnerability than CVE-2003-0693.
37 CVE-2003-0693 Exec Code 2003-09-22 2018-05-03
10.0
None Remote Low Not required Complete Complete Complete
A "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to execute arbitrary code by causing an incorrect amount of memory to be freed and corrupting the heap, a different vulnerability than CVE-2003-0695.
38 CVE-2003-0682 2003-10-06 2018-05-03
7.5
None Remote Low Not required Partial Partial Partial
"Memory bugs" in OpenSSH 3.7.1 and earlier, with unknown impact, a different set of vulnerabilities than CVE-2003-0693 and CVE-2003-0695.
39 CVE-2001-1382 2001-09-27 2008-09-05
5.0
None Remote Low Not required Partial None None
The "echo simulation" traffic analysis countermeasure in OpenSSH before 2.9.9p2 sends an additional echo packet after the password and carriage return is entered, which could allow remote attackers to determine that the countermeasure is being used.
40 CVE-2001-1380 2001-10-18 2018-05-03
7.5
None Remote Low Not required Partial Partial Partial
OpenSSH before 2.9.9, while using keypairs and multiple keys of different types in the ~/.ssh/authorized_keys2 file, may not properly handle the "from" option associated with a key, which could allow remote attackers to login from unauthorized IP addresses.
41 CVE-2001-0872 +Priv 2001-12-21 2018-05-03
7.2
None Local Low Not required Complete Complete Complete
OpenSSH 3.0.1 and earlier with UseLogin enabled does not properly cleanse critical environment variables such as LD_PRELOAD, which allows local users to gain root privileges.
42 CVE-2001-0816 Bypass 2001-12-06 2017-10-10
7.5
None Remote Low Not required Partial Partial Partial
OpenSSH before 2.9.9, when running sftp using sftp-server and using restricted keypairs, allows remote authenticated users to bypass authorized_keys2 command= restrictions using sftp commands.
43 CVE-2001-0529 2001-08-14 2017-10-10
7.2
None Local Low Not required Complete Complete Complete
OpenSSH version 2.9 and earlier, with X forwarding enabled, allows a local attacker to delete any file named 'cookies' via a symlink attack.
44 CVE-2000-0143 2000-02-11 2008-09-10
4.6
None Local Low Not required Partial Partial Partial
The SSH protocol server sshd allows local users without shell access to redirect a TCP connection through a service that uses the standard system password database for authentication, such as POP or FTP.
Total number of vulnerabilities : 44   Page : 1 (This Page)
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