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Samsung Galaxy S3/S4 SMS Spoofing

Samsung Galaxy S3/S4 SMS Spoofing
Posted Jul 17, 2013
Authored by Z.X.

The Samsung Galaxy S3 and S4 phones come with a pre-loaded application that allows for spoofing and creation of arbitrary SMS content.

tags | advisory, arbitrary, spoof
advisories | CVE-2013-4764, CVE-2013-4763
MD5 | 4d798f1b865ddfda3b09cc7cdfb713b0

Samsung Galaxy S3/S4 SMS Spoofing

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Hi list,
I would like to inform you that the details of the vulnerability in
built-in system app of Samsung Galaxy S3/S4 (assigned as CVE-2013-4763
and CVE-2013-4764) are now disclosed to public.

In Samsung Galaxy S3/S4, a pre-loaded app, i.e.,
sCloudBackupProvider.apk, is used to provide backup functionality for
the users, and it unintentially exposes several unprotected
components. By exploiting these unprotected components, an
unprivileged app can trigger a so-called “restore” operation to write
SMS messages back to the standard SMS database file (mmssms.db) used
by the system messaging app, i.e., SecMms.apk. As a result, a smishing
attack can effectively create and inject arbitrary (fake) SMS text
messages. Similarly, fake MMS messages and call logs are also
possible. This vulnerability has been disclosed in CVE-2013-4763.

Also, these components can be sequentially triggered in a specific
order to create arbitrary SMS content, inject to system-wide SMS
database, and then trigger the built-in SMS-sending behavior (to
arbitrary destination). This vulnerability has been disclosed in
CVE-2013-4764.

QIHU Inc. discovered these vulnerability and informed Samsung Corp. in
June 10, 2013. Samsung confirmed the vulerability and is now preparing
an OTA update. As a temporary workaround, disable the
sCloudBackupProvider.apk app would help block known attack vectors.

Details of CVE-2013-4763 and CVE-2013-4764 can be also found in QIHU
Inc.'s official site:
http://shouji.360.cn/securityReportlist/CVE-2013-4763.html
http://shouji.360.cn/securityReportlist/CVE-2013-4764.html

Regards,
Z.X. from QIHU Inc.

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