{"id":53577,"date":"2019-12-05T00:00:00","date_gmt":"2019-12-04T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/mnozhestvennye-uyazvimosti-v-openbsd"},"modified":"2020-02-18T14:01:30","modified_gmt":"2020-02-18T11:01:30","slug":"mnozhestvennye-uyazvimosti-v-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/mnozhestvennye-uyazvimosti-v-openbsd","title":{"rendered":"Meerdere kwetsbaarheden in OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Specialisten van Qualys Labs hebben verschillende beveiligingsproblemen ontdekt in verband met de mogelijkheid om programma's te misleiden die verantwoordelijk zijn voor de in BSD toegepaste mechanismen voor wachtwoordverificatie (vergelijkbaar met PAM). De misleiding bestaat uit het doorgeven van de gebruikersnaam «-schallenge» of «-schallenge:passwd», die vervolgens niet als gebruikersnaam, maar als optie wordt ge\u00efnterpreteerd. Hierna accepteert het systeem elk wachtwoord. Kwetsbare services zoals smtpd, ldapd en radiusd staan uiteindelijk onrechtmatige toegang toe. De service sshd kan echter niet worden uitgebuit, omdat sshd merkt dat de gebruiker «-schallenge» in werkelijkheid niet bestaat. Het programma su crasht bij een poging tot directe exploitatie, omdat het ook probeert de uid van de niet-bestaande gebruiker te achterhalen.<\/p>\n

Ook werden verschillende uiteenlopende kwetsbaarheden in xlock, bij de autorisatie via S\/Key en Yubikey, en in su, die niet gerelateerd zijn aan het specificeren van de gebruiker «-schallenge», bekendgemaakt. De kwetsbaarheid in xlock stelt een gewone gebruiker in staat om zijn privileges te verhogen tot de groep auth. Door de verkeerde werking van de autorisatie mechanismen via S\/Key en Yubikey is het mogelijk om de privileges van de groep auth naar de gebruiker root te verhogen, maar in de standaardconfiguratie van OpenBSD werkt dit niet, omdat de autorisatie via S\/Key en Yubikey is uitgeschakeld. Ten slotte stelt de kwetsbaarheid in su een gebruiker in staat om de limieten voor systeembronnen, zoals het aantal geopende bestandsdescriptoren, te verhogen.<\/p>\n

Op dit moment zijn de kwetsbaarheden verholpen en zijn beveiligingsupdates beschikbaar via het standaardmechanisme syspatch(8).<\/p>\n

Bron: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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