NOTE: the vendor does not recognize user enumeration as a vulnerability for this product. This occurs because a challenge is sent only when that combination could be valid for a login session. ** 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. 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. 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. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed." Published: Ma7:15:07 PM -0500 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. 20190417 Announce: OpenSSH 8.** DISPUTED ** An issue was discovered in OpenSSH before 8.9.20190820 (SSHD-925) See if SCP vulnerability CVE-2019-6111 applies and mitigate it if so.20190623 (SSHD-925) See if SCP vulnerability CVE-2019-6111 applies and mitigate it if so.20190620 (SSHD-925) See if SCP vulnerability CVE-2019-6111 applies and mitigate it if so.RHSA-2019:3702: openssh security, bug fix, and enhancement update (Moderate) Pam_ssh_agent_auth is signed with Red Hat redhatrelease2 key Openssh-server is signed with Red Hat redhatrelease2 key Openssh-server is earlier than 0:8.0p1-3.el8 Openssh-ldap is signed with Red Hat redhatrelease2 key Openssh-ldap is earlier than 0:8.0p1-3.el8 Openssh-keycat is signed with Red Hat redhatrelease2 key Openssh-keycat is earlier than 0:8.0p1-3.el8 Openssh-debugsource is signed with Red Hat redhatrelease2 key Openssh-debugsource is earlier than 0:8.0p1-3.el8 Openssh-clients is signed with Red Hat redhatrelease2 key Openssh-clients is earlier than 0:8.0p1-3.el8 Openssh-cavs is signed with Red Hat redhatrelease2 key Openssh-cavs is earlier than 0:8.0p1-3.el8 Openssh-askpass is signed with Red Hat redhatrelease2 key Openssh-askpass is earlier than 0:8.0p1-3.el8 Openssh is signed with Red Hat redhatrelease2 key Red Hat Enterprise Linux must be installed The goal of this pattern is to discover server software that only applies filters to one version, but not the host key types are ignored in FIPS despite being in the policy This gives the attacker many opportunities to discover and abuse a number of common filtering problems. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. An attacker would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. This attack targets the encoding of the Slash characters. Using Escaped Slashes in Alternate Encoding.It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. This is often referred as escaped ending or percent-encoding. For instance US-ASCII space character would be represented with %20. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). A URL may contain special character that need special syntax handling in order to be interpreted. An attacker can take advantage of the multiple ways of encoding a URL and abuse the interpretation of the URL. This attack targets the encoding of the URL combined with the encoding of the slash characters.
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