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Full Discussion: Group File Format/Security
Top Forums UNIX for Dummies Questions & Answers Group File Format/Security Post 302680163 by Corona688 on Wednesday 1st of August 2012 10:50:39 AM
Old 08-01-2012
Quote:
Originally Posted by keithhhs79
I was interested in knowing in general what potential security vulnerabilities could be created by having formatting issues in the etc group file.
The problem is that 'formatting issues' can put anything in the group file. You may have users belonging to groups they shouldn't. You may have users not belonging to groups they should.

The implications of that depend on which groups have been messed up in what way.
This User Gave Thanks to Corona688 For This Post:
 

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GSHADOW(5)						   File Formats and Conversions 						GSHADOW(5)

NAME
gshadow - shadowed group file DESCRIPTION
/etc/gshadow contains the shadowed information for group accounts. This file must not be readable by regular users if password security is to be maintained. Each line of this file contains the following colon-separated fields: group name It must be a valid group name, which exist on the system. encrypted password Refer to crypt(3) for details on how this string is interpreted. If the password field contains some string that is not a valid result of crypt(3), for instance ! or *, users will not be able to use a unix password to access the group (but group members do not need the password). The password is used when a user who is not a member of the group wants to gain the permissions of this group (see newgrp(1)). This field may be empty, in which case only the group members can gain the group permissions. A password field which starts with an exclamation mark means that the password is locked. The remaining characters on the line represent the password field before the password was locked. This password supersedes any password specified in /etc/group. administrators It must be a comma-separated list of user names. Administrators can change the password or the members of the group. Administrators also have the same permissions as the members (see below). members It must be a comma-separated list of user names. Members can access the group without being prompted for a password. You should use the same list of users as in /etc/group. FILES
/etc/group Group account information. /etc/gshadow Secure group account information. SEE ALSO
gpasswd(5), group(5), grpck(8), grpconv(8), newgrp(1). shadow-utils 4.5 01/25/2018 GSHADOW(5)
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