Apple has released software update fixing 33 vulnerabilities in iOS versions prior to iOS 8.4. These vulnerabilities are caused by problems in various iOS components. There are multiple attack vectors, a remote attacker could intercept SSL/TLS connections and perform man-in-the-middle (MITM) attacks (also known as Logjam attack). The attacker could also entice a user to open a specially crafted font file, PDF file, TIFF file, SMS or web page to exploit the vulnerabilities.
Depending on the vulnerability exploited, a successful attack could lead to cross site scripting, information disclosure or remote arbitrary code execution.
The product vendor has released iOS 8.4 to address the issues. Users can obtain the updates by using the auto-update mechanism. Users of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.
https://support.apple.com/zh-hk/HT204941
https://support.apple.com/kb/DL1818
https://www.hkcert.org/my_url/en/alert/15070201
https://www.us-cert.gov/ncas/current-activity/2015/06/30/Apple-Releases-Security-Updates-QuickTime-Safari-Mac-EFI-OS-X
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1741
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8127 (to CVE-2014-8130)
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1152 (to CVE-2015-1153)
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1155 (to CVE-2015-1157)
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3658 (to CVE-2015-3659)
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3684 (to CVE-2015-3690)
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3694
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3703
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3710
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3717
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3719
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3721 (to CVE-2015-3728)
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4000