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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 6df8ff49d9
commit 254eb04f17
22 changed files with 680 additions and 210 deletions
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15
contrib/pg_upgrade/dump.c
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@@ -46,6 +46,15 @@ generate_old_dump(void)
char sql_file_name[MAXPGPATH],
log_file_name[MAXPGPATH];
DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
PQExpBufferData connstr,
escaped_connstr;
initPQExpBuffer(&connstr);
appendPQExpBuffer(&connstr, "dbname=");
appendConnStrVal(&connstr, old_db->db_name);
initPQExpBuffer(&escaped_connstr);
appendShellString(&escaped_connstr, connstr.data);
termPQExpBuffer(&connstr);
pg_log(PG_STATUS, "%s", old_db->db_name);
snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
@@ -53,10 +62,12 @@ generate_old_dump(void)
parallel_exec_prog(log_file_name, NULL,
"\"%s/pg_dump\" %s --schema-only --quote-all-identifiers "
"--binary-upgrade --format=custom %s --file=\"%s\" \"%s\"",
"--binary-upgrade --format=custom %s --file=\"%s\" %s",
new_cluster.bindir, cluster_conn_opts(&old_cluster),
log_opts.verbose ? "--verbose" : "",
sql_file_name, old_db->db_name);
sql_file_name, escaped_connstr.data);
termPQExpBuffer(&escaped_connstr);
}
/* reap all children */