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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 c1b048f498
commit 95a6855c55
21 changed files with 665 additions and 202 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
contrib/pg_upgrade/version_old_8_3.c
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@ -367,8 +367,13 @@ old_8_3_rebuild_tsvector_tables(ClusterInfo *cluster, bool check_mode)
pg_log(PG_FATAL, "could not open file \"%s\": %s\n", output_path, getErrorText(errno));
if (!db_used)
{
fprintf(script, "\\connect %s\n\n",
quote_identifier(active_db->db_name));
PQExpBufferData connectbuf;
initPQExpBuffer(&connectbuf);
appendPsqlMetaConnect(&connectbuf, active_db->db_name);
appendPQExpBufferChar(&connectbuf, '\n');
fputs(connectbuf.data, script);
termPQExpBuffer(&connectbuf);
db_used = true;
}
@ -483,8 +488,12 @@ old_8_3_invalidate_hash_gin_indexes(ClusterInfo *cluster, bool check_mode)
pg_log(PG_FATAL, "could not open file \"%s\": %s\n", output_path, getErrorText(errno));
if (!db_used)
{
fprintf(script, "\\connect %s\n",
quote_identifier(active_db->db_name));
PQExpBufferData connectbuf;
initPQExpBuffer(&connectbuf);
appendPsqlMetaConnect(&connectbuf, active_db->db_name);
fputs(connectbuf.data, script);
termPQExpBuffer(&connectbuf);
db_used = true;
}
fprintf(script, "REINDEX INDEX %s.%s;\n",
@ -602,8 +611,12 @@ old_8_3_invalidate_bpchar_pattern_ops_indexes(ClusterInfo *cluster,
pg_log(PG_FATAL, "could not open file \"%s\": %s\n", output_path, getErrorText(errno));
if (!db_used)
{
fprintf(script, "\\connect %s\n",
quote_identifier(active_db->db_name));
PQExpBufferData connectbuf;
initPQExpBuffer(&connectbuf);
appendPsqlMetaConnect(&connectbuf, active_db->db_name);
fputs(connectbuf.data, script);
termPQExpBuffer(&connectbuf);
db_used = true;
}
fprintf(script, "REINDEX INDEX %s.%s;\n",
@ -724,8 +737,13 @@ old_8_3_create_sequence_script(ClusterInfo *cluster)
pg_log(PG_FATAL, "could not open file \"%s\": %s\n", output_path, getErrorText(errno));
if (!db_used)
{
fprintf(script, "\\connect %s\n\n",
quote_identifier(active_db->db_name));
PQExpBufferData connectbuf;
initPQExpBuffer(&connectbuf);
appendPsqlMetaConnect(&connectbuf, active_db->db_name);
appendPQExpBufferChar(&connectbuf, '\n');
fputs(connectbuf.data, script);
termPQExpBuffer(&connectbuf);
db_used = true;
}