Rapid7 Vulnerability & Exploit Database

OpenSSH Reverse DNS Access Control Bypass Vulnerability

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OpenSSH Reverse DNS Access Control Bypass Vulnerability

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:P/I:P/A:P)
Published
07/02/2003
Created
07/25/2018
Added
11/01/2004
Modified
08/28/2019

Description

OpenSSH 3.6.1 and earlier, when restricting host access by numeric IP addresses and with VerifyReverseMapping disabled, allows remote attackers to bypass "from=" and "user@host" address restrictions by connecting to a host from a system whose reverse DNS hostname contains the numeric IP address.

Solution(s)

  • openbsd-openssh-upgrade-3_6_2
  • ssh-openssh-reverse-dns-access-control-bypass-workaround

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