Kod programskog paketa curl uočeni su višestruki sigurnosni nedostaci koji zlonamjernim korisnicima omogućuju neovlašten pristup sustavu, izvršavanje proizvoljnog programskog koda, pokretanje napada uskraćivanja usluge i tzv. MITM (eng. man in the middle) napada.
Paket:
curl 7.x
Operacijski sustavi:
Ubuntu Linux 8.04, Ubuntu Linux 10.04, Ubuntu Linux 10.10, Ubuntu Linux 11.04
Kritičnost:
5.5
Problem:
neodgovarajuće rukovanje datotekama, nepravilno rukovanje ovlastima, pogreška u programskoj komponenti
Uočeni nedostaci posljedica su loše ostvarenog mehanizma GSSAPI autentikacije, neodgovarajućeg ograničavanja povratnih (eng. callback) podataka koji se šalju aplikaciji te nepravilnog rukovanja SSL (eng. Secure Sockets Layer) certifikatima.
Posljedica:
Udaljeni, zlonamjerni korisnici spomenute nedostatke mogu iskoristiti za neovlašten pristup, izvođenje DoS napada, pokretanje proizvoljnog programskog koda i otkrivanje/izmjenu podataka kroz MITM napad.
Rješenje:
Svim se korisnicima savjetuje primjena objavljene nadogradnje koja navedene nedostatke ispravlja.
==========================================================================
Ubuntu Security Notice USN-1158-1
June 24, 2011
curl vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS
Summary:
Multiple vulnerabilities in curl.
Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries
Details:
Richard Silverman discovered that when doing GSSAPI authentication,
libcurl unconditionally performs credential delegation, handing the
server a copy of the client's security credential. (CVE-2011-2192)
Wesley Miaw discovered that when zlib is enabled, libcurl does not
properly restrict the amount of callback data sent to an application
that requests automatic decompression. This might allow an attacker to
cause a denial of service via an application crash or possibly execute
arbitrary code with the privilege of the application. This issue only
affected Ubuntu 8.04 LTS and Ubuntu 10.04 LTS. (CVE-2010-0734)
USN 818-1 fixed an issue with curl's handling of SSL certificates with
zero bytes in the Common Name. Due to a packaging error, the fix for
this issue was not being applied during the build. This issue only
affected Ubuntu 8.04 LTS. We apologize for the error. (CVE-2009-2417)
Original advisory details:
Scott Cantor discovered that curl did not correctly handle SSL
certificates with zero bytes in the Common Name. A remote attacker
could exploit this to perform a man in the middle attack to view
sensitive information or alter encrypted communications.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
libcurl3 7.21.3-1ubuntu1.2
libcurl3-gnutls 7.21.3-1ubuntu1.2
libcurl3-nss 7.21.3-1ubuntu1.2
Ubuntu 10.10:
libcurl3 7.21.0-1ubuntu1.1
libcurl3-gnutls 7.21.0-1ubuntu1.1
Ubuntu 10.04 LTS:
libcurl3 7.19.7-1ubuntu1.1
libcurl3-gnutls 7.19.7-1ubuntu1.1
Ubuntu 8.04 LTS:
libcurl3 7.18.0-1ubuntu2.3
libcurl3-gnutls 7.18.0-1ubuntu2.3
After a standard system update you need to restart any applications
that make use of libcurl to make all the necessary changes.
References:
CVE-2009-2417, CVE-2010-0734, CVE-2011-2192
Package Information:
https://launchpad.net/ubuntu/+source/curl/7.21.3-1ubuntu1.2
https://launchpad.net/ubuntu/+source/curl/7.21.0-1ubuntu1.1
https://launchpad.net/ubuntu/+source/curl/7.19.7-1ubuntu1.1
https://launchpad.net/ubuntu/+source/curl/7.18.0-1ubuntu2.3
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