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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 8adff37830
commit 286c8bc646
21 changed files with 656 additions and 207 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/bin/scripts/vacuumdb.c
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@@ -539,6 +539,7 @@ vacuum_all_databases(vacuumingOptions *vacopts,
{
PGconn *conn;
PGresult *result;
PQExpBufferData connstr;
int stage;
int i;
@@ -549,6 +550,7 @@ vacuum_all_databases(vacuumingOptions *vacopts,
progname, echo);
PQfinish(conn);
initPQExpBuffer(&connstr);
if (analyze_in_stages)
{
/*
@@ -563,10 +565,11 @@ vacuum_all_databases(vacuumingOptions *vacopts,
{
for (i = 0; i < PQntuples(result); i++)
{
const char *dbname;
resetPQExpBuffer(&connstr);
appendPQExpBuffer(&connstr, "dbname=");
appendConnStrVal(&connstr, PQgetvalue(result, i, 0));
dbname = PQgetvalue(result, i, 0);
vacuum_one_database(dbname, vacopts,
vacuum_one_database(connstr.data, vacopts,
stage,
NULL,
host, port, username, prompt_password,
@@ -579,10 +582,11 @@ vacuum_all_databases(vacuumingOptions *vacopts,
{
for (i = 0; i < PQntuples(result); i++)
{
const char *dbname;
resetPQExpBuffer(&connstr);
appendPQExpBuffer(&connstr, "dbname=");
appendConnStrVal(&connstr, PQgetvalue(result, i, 0));
dbname = PQgetvalue(result, i, 0);
vacuum_one_database(dbname, vacopts,
vacuum_one_database(connstr.data, vacopts,
ANALYZE_NO_STAGE,
NULL,
host, port, username, prompt_password,
@@ -590,6 +594,7 @@ vacuum_all_databases(vacuumingOptions *vacopts,
progname, echo, quiet);
}
}
termPQExpBuffer(&connstr);
PQclear(result);
}