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jeudi 25 septembre 2014

Faille GNU Bash

Aujourd'hui, une faille au niveau du GNU Bash a été découverte ! Mettez à jour vos serveurs.

Pour tester la chose, voici un exemple fourni par blogmotion :

env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

Si vous voyez ceci s'afficher, c'est pas bon :-(

vulnerable

this is a test

Si vous voyez ceci, c'est bon !

bash: avertissement :x: ignoring function definition attempt

bash: erreur lors de l'import de la définition de fonction pour « x »

this is a test

Voir le site du CERT France pour plus de détails sur la faille en question.

mardi 18 février 2014

Synology DSM : Mise à jour IMPORTANTE !

Synology a envoyé un e-mail aux utilisateurs de ses NAS à propos de 2 failles importantes découvertes dans le logiciel DSM. IL est FORTEMENT conseillé de mettre à jour le plus rapidement possible.

http://www.synology.com/fr-fr/support/download

Voici le contenu de l'e-mail reçu dans la journée :

Dear Synology users,

Synology® confirmed known security issues (reported as CVE-2013-6955 and CVE-2013-6987) which would cause compromise to file access authority in DSM. An updated DSM version resolving these issues has been released accordingly.

The followings are possible symptoms to appear on affected DiskStation and RackStation:

   Exceptionally high CPU usage detected in Resource Monitor:
   CPU resource occupied by processes such as dhcp.pid, minerd, synodns, PWNED, PWNEDb, PWNEDg, PWNEDm, or any processes with PWNED in their names
   Appearance of non-Synology folder:
   An automatically created shared folder with the name “startup”, or a non-Synology folder appearing under the path of “/root/PWNED”
   Redirection of the Web Station:
   “Index.php” is redirected to an unexpected page
   Appearance of non-Synology CGI program:
   Files with meaningless names exist under the path of “/usr/syno/synoman”
   Appearance of non-Synology script file:
   Non-Synology script files, such as “S99p.sh”, appear under the path of “/usr/syno/etc/rc.d”

If users identify any of above situation, they are strongly encouraged to do the following:

   For DiskStation or RackStation running on DSM 4.3, please follow the instruction here to REINSTALL DSM 4.3-3827.
   For DiskStation or RackStation running on DSM 4.0, it’s recommended to REINSTALL DSM 4.0-2259 or onward from Synology Download Center.
   For DiskStation or RackStation running on DSM 4.1 or DSM 4.2, it’s recommended to REINSTALL DSM 4.2-3243 or onward from Synology Download Center.

For other users who haven’t encountered above symptoms, it is recommended to go to DSM > Control Panel > DSM Update page, update to versions above to protect DiskStation from malicious attacks.

Synology has taken immediate actions to fix vulnerability at the point of identifying malicious attacks. As proliferation of cybercrime and increasingly sophisticated malware evolves, Synology continues to casting resources mitigating threats and dedicates to providing the most reliable solutions for users. If users still notice their DiskStation behaving suspiciously after being upgraded to the latest DSM version, please contact security@synology.com.

Sincerely, Synology Development Team