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Obstruct shell, SQL, and conninfo injection via database and role names.

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Due to simplistic quoting and confusion of database names with conninfo
strings, roles with the CREATEDB or CREATEROLE option could escalate to
superuser privileges when a superuser next ran certain maintenance
commands.  The new coding rule for PQconnectdbParams() calls, documented
at conninfo_array_parse(), is to pass expand_dbname=true and wrap
literal database names in a trivial connection string.  Escape
zero-length values in appendConnStrVal().  Back-patch to 9.1 (all
supported versions).

Nathan Bossart, Michael Paquier, and Noah Misch.  Reviewed by Peter
Eisentraut.  Reported by Nathan Bossart.

Security: CVE-2016-5424
This commit is contained in:
Noah Misch
2016-08-08 10:07:46 -04:00
parent d2dd5df514
commit a2385cac13
21 changed files with 572 additions and 193 deletions
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6
contrib/pg_upgrade/option.c
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@@ -52,6 +52,7 @@ parseCommandLine(int argc, char *argv[])
int option; /* Command line option */
int optindex = 0; /* used by getopt_long */
int os_user_effective_id;
PQExpBufferData userbuf;
user_opts.transfer_mode = TRANSFER_MODE_COPY;
@@ -211,6 +212,11 @@ parseCommandLine(int argc, char *argv[])
"old cluster data resides");
validateDirectoryOption(&new_cluster.pgdata, "NEWDATADIR", "-D",
"new cluster data resides");
initPQExpBuffer(&userbuf);
appendShellString(&userbuf, os_info.user);
/* Abandon struct, but keep its buffer until process exit. */
os_info.user_shell_arg = userbuf.data;
}