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Openbsd : Security Vulnerabilities (CVSS score between 3 and 8.99)

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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-2019-8460 20 DoS 2019-08-26 2019-09-05
5.0
None Remote Low Not required None None Partial
Reuven Plevinsky and Tal Vainshtein of Check Point Software Technologies Ltd. discovered that OpenBSD kernel (all versions, including 6.5) can be forced to create long chains of TCP SACK holes that cause very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.
2 CVE-2019-6111 20 Dir. Trav. 2019-01-31 2019-05-03
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).
3 CVE-2019-6110 284 2019-01-31 2019-04-18
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.
4 CVE-2019-6109 284 2019-01-31 2019-05-03
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.
5 CVE-2018-15919 200 +Info 2018-08-28 2018-12-22
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.'
6 CVE-2018-15473 200 +Info 2018-08-17 2019-08-06
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.
7 CVE-2018-14775 20 DoS 2018-08-01 2018-10-03
4.9
None Local Low Not required None None Complete
tss_alloc in sys/arch/i386/i386/gdt.c in OpenBSD 6.2 and 6.3 has a Local Denial of Service (system crash) due to incorrect I/O port access control on the i386 architecture.
8 CVE-2018-8970 295 +Info 2018-03-24 2018-04-24
5.8
None Remote Medium Not required Partial Partial None
The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.
9 CVE-2017-1000373 400 Exec Code 2017-06-19 2017-10-23
6.4
None Remote Low Not required None Partial Partial
The OpenBSD qsort() function is recursive, and not randomized, an attacker can construct a pathological input array of N elements that causes qsort() to deterministically recurse N/4 times. This allows attackers to consume arbitrary amounts of stack memory and manipulate stack memory to assist in arbitrary code execution attacks. This affects OpenBSD 6.1 and possibly earlier versions.
10 CVE-2017-1000372 Exec Code Bypass 2017-06-19 2019-10-02
7.5
None Remote Low Not required Partial Partial Partial
A flaw exists in OpenBSD's implementation of the stack guard page that allows attackers to bypass it resulting in arbitrary code execution using setuid binaries such as /usr/bin/at. This affects OpenBSD 6.1 and possibly earlier versions.
11 CVE-2017-15906 269 2017-10-25 2019-10-02
5.0
None Remote Low Not required None Partial None
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.
12 CVE-2017-5850 770 DoS 2017-03-27 2019-10-02
7.8
None Remote Low Not required None None Complete
httpd in OpenBSD allows remote attackers to cause a denial of service (memory consumption) via a series of requests for a large file using an HTTP Range header.
13 CVE-2016-10708 476 DoS 2018-01-21 2019-06-26
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.
14 CVE-2016-10012 119 Overflow +Priv 2017-01-04 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.
15 CVE-2016-10010 264 +Priv 2017-01-04 2018-05-31
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.
16 CVE-2016-10009 426 2017-01-04 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.
17 CVE-2016-8858 399 DoS 2016-12-09 2018-09-19
7.8
None Remote Low Not required None None Complete
** DISPUTED ** The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."
18 CVE-2016-6522 190 DoS Overflow 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
Integer overflow in the uvm_map_isavail function in uvm/uvm_map.c in OpenBSD 5.9 allows local users to cause a denial of service (kernel panic) via a crafted mmap call, which triggers the new mapping to overlap with an existing mapping.
19 CVE-2016-6515 20 DoS 2016-08-07 2018-09-11
7.8
None Remote Low Not required None None Complete
The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
20 CVE-2016-6350 476 DoS 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
OpenBSD 5.8 and 5.9 allows local users to cause a denial of service (NULL pointer dereference and panic) via a sysctl call with a path starting with 10,9.
21 CVE-2016-6247 20 DoS 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
OpenBSD 5.8 and 5.9 allows certain local users to cause a denial of service (kernel panic) by unmounting a filesystem with an open vnode on the mnt_vnodelist.
22 CVE-2016-6246 20 DoS 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
OpenBSD 5.8 and 5.9 allows certain local users with kern.usermount privileges to cause a denial of service (kernel panic) by mounting a tmpfs with a VNOVAL in the (1) username, (2) groupname, or (3) device name of the root node.
23 CVE-2016-6245 DoS 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
OpenBSD 5.8 and 5.9 allows local users to cause a denial of service (kernel panic) via a large size in a getdents system call.
24 CVE-2016-6244 20 DoS 2017-03-07 2017-03-08
7.8
None Remote Low Not required None None Complete
The sys_thrsigdivert function in kern/kern_sig.c in the OpenBSD kernel 5.9 allows remote attackers to cause a denial of service (panic) via a negative "ts.tv_sec" value.
25 CVE-2016-6243 20 DoS 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
thrsleep in kern/kern_synch.c in OpenBSD 5.8 and 5.9 allows local users to cause a denial of service (kernel panic) via a crafted value in the tsp parameter of the __thrsleep system call.
26 CVE-2016-6242 189 DoS 2017-03-07 2017-03-08
4.9
None Local Low Not required None None Complete
OpenBSD 5.8 and 5.9 allows local users to cause a denial of service (assertion failure and kernel panic) via a large ident value in a kevent system call.
27 CVE-2016-6241 190 Exec Code Overflow 2017-03-07 2017-08-31
7.2
None Local Low Not required Complete Complete Complete
Integer overflow in the amap_alloc1 function in OpenBSD 5.8 and 5.9 allows local users to execute arbitrary code with kernel privileges via a large size value.
28 CVE-2016-6240 189 Exec Code 2017-03-07 2017-08-31
7.2
None Local Low Not required Complete Complete Complete
Integer truncation error in the amap_alloc function in OpenBSD 5.8 and 5.9 allows local users to execute arbitrary code with kernel privileges via a large size value.
29 CVE-2016-6239 20 DoS 2017-03-07 2017-08-31
4.9
None Local Low Not required None None Complete
The mmap extension __MAP_NOFAULT in OpenBSD 5.8 and 5.9 allows attackers to cause a denial of service (kernel panic and crash) via a large size value.
30 CVE-2016-6210 200 +Info 2017-02-13 2018-01-04
4.3
None Remote Medium Not required Partial None None
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.
31 CVE-2016-3115 Bypass 2016-03-22 2018-09-11
5.5
None Remote Low Single system Partial Partial None
Multiple CRLF injection vulnerabilities in session.c in sshd in OpenSSH before 7.2p2 allow remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data, related to the (1) do_authenticated1 and (2) session_x11_req functions.
32 CVE-2016-1908 254 2017-04-11 2018-09-11
7.5
None Remote Low Not required Partial Partial Partial
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 SECURITY extension on this X11 server.
33 CVE-2016-1907 119 DoS Overflow 2016-01-19 2017-02-16
5.0
None Remote Low Not required None None Partial
The ssh_packet_read_poll2 function in packet.c in OpenSSH before 7.1p2 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via crafted network traffic.
34 CVE-2016-0778 119 DoS Overflow 2016-01-14 2018-10-09
4.6
None Remote High Single system Partial Partial Partial
The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.
35 CVE-2016-0777 200 +Info 2016-01-14 2018-10-09
4.0
None Remote Low Single system Partial None None
The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote servers to obtain sensitive information from process memory by requesting transmission of an entire buffer, as demonstrated by reading a private key.
36 CVE-2015-8325 264 +Priv 2016-04-30 2018-06-29
7.2
None Local Low Not required Complete Complete Complete
The do_setup_env function in session.c in sshd in OpenSSH through 7.2p2, when the UseLogin feature is enabled and PAM is configured to read .pam_environment files in user home directories, allows local users to gain privileges by triggering a crafted environment for the /bin/login program, as demonstrated by an LD_PRELOAD environment variable.
37 CVE-2015-7687 416 DoS Exec Code 2017-10-16 2017-11-01
7.5
None Remote Low Not required Partial Partial Partial
Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via vectors involving req_ca_vrfy_smtp and req_ca_vrfy_mta.
38 CVE-2015-6565 264 DoS 2015-08-23 2017-09-01
7.2
None Local Low Not required Complete Complete Complete
sshd in OpenSSH 6.8 and 6.9 uses world-writable permissions for TTY devices, which allows local users to cause a denial of service (terminal disruption) or possibly have unspecified other impact by writing to a device, as demonstrated by writing an escape sequence.
39 CVE-2015-6564 264 +Priv 2015-08-23 2018-09-11
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.
40 CVE-2015-5600 264 DoS 2015-08-02 2018-09-11
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.
41 CVE-2015-5352 264 Bypass 2015-08-02 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.
42 CVE-2014-9424 DoS 2014-12-28 2014-12-30
7.5
None Remote Low Not required Partial Partial Partial
Double free vulnerability in the ssl_parse_clienthello_use_srtp_ext function in d1_srtp.c in LibreSSL before 2.1.2 allows remote attackers to cause a denial of service or possibly have unspecified other impact by triggering a certain length-verification error during processing of a DTLS handshake.
43 CVE-2014-9278 287 Bypass 2014-12-06 2017-09-07
4.0
None Remote Low Single system None Partial None
The OpenSSH server, as used in Fedora and Red Hat Enterprise Linux 7 and when running in a Kerberos environment, allows remote authenticated users to log in as another user when they are listed in the .k5users file of that user, which might bypass intended authentication requirements that would force a local login.
44 CVE-2014-7250 399 DoS 2014-12-11 2014-12-12
5.0
None Remote Low Not required None None Partial
The TCP stack in 4.3BSD Net/2, as used in FreeBSD 5.4, NetBSD possibly 2.0, and OpenBSD possibly 3.6, does not properly implement the session timer, which allows remote attackers to cause a denial of service (resource consumption) via crafted packets.
45 CVE-2014-2653 20 2014-03-27 2017-01-06
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.
46 CVE-2014-2532 264 Bypass 2014-03-18 2018-07-18
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.
47 CVE-2014-1692 119 DoS Overflow Mem. Corr. 2014-01-29 2017-08-28
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.
48 CVE-2013-4548 264 Bypass 2013-11-08 2019-10-09
6.0
None Remote Medium Single system Partial Partial Partial
The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.
49 CVE-2013-2125 310 DoS 2014-05-27 2017-08-28
5.0
None Remote Low Not required None None Partial
OpenSMTPD before 5.3.2 does not properly handle SSL sessions, which allows remote attackers to cause a denial of service (connection blocking) by keeping a connection open.
50 CVE-2012-0814 255 +Info 2012-01-27 2017-08-28
3.5
None Remote Medium Single system 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.
Total number of vulnerabilities : 215   Page : 1 (This Page)2 3 4 5
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