Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT Security Bulletin ASB-2017.0203 Code execution with system privileges in iOS and MacOS 21 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: iOS MacOS Operating System: Apple iOS Mac OS Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-13833 CVE-2017-13829 Member content until: Thursday, December 21 2017 OVERVIEW A vulnerability was addressed in iOS 11.1.2 and MacOS 10.13.1 which may have enabled arbitrary code execution with system privileges. [1] IMPACT The vendor has provided the following details regarding these issues: "Impact: An application may be able to execute arbitrary code with system privileges. Description: A memory corruption issue was addressed with improved memory handling." [1] Zero Day Initiative adds: "This vulnerability allows local attackers to escalate privileges on vulnerable installations of Apple macOS. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the nsurlstoraged service. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to escalate privileges under the context of the current service." [2] The other issue is similar, but with one difference: "The issue results from the lack of proper validation of a reference count, which can result in an integer overflow when incrementing it." [3] MITIGATION The vendor advises to update to the latest versions of the software. [1] [4] REFERENCES [1] About the security content of iOS 11 https://support.apple.com/en-us/HT208112 [2] Zero Day Initiative: nsurlstoraged Heap-based Buffer Overflow Privilege Escalation Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-17-924/ [3] Zero Day Initiative: Apple macOS nsurlstoraged Integer Overflow Privilege Escalation Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-17-925/ [4] About Apple security updates https://support.apple.com/en-au/HT201222 AusCERT has made every effort to ensure that the information contained in this document is accurate. However, the decision to use the information described is the responsibility of each user or organisation. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWhPDJIx+lLeg9Ub1AQjxaRAAhKauz+SI2Dp+zho6Pj/BHC/aCs1z14F8 /J6UUm6joLAhs7Nl8MdA1hjNjXPETiRFYkvjU0LyxvX3iyxpsg4TxhLCkTSBTw/d oELPJScz5uPgxlzy5R6yySDy9fxeRN+AvZd1iRIjWHhq+nEqs3dfYU93mdy64QPp XNjMKw71ezXrFIJoZnfeLDlNmrgAJzLbZy92QcIbp8Up0UBxmht0aZeDNmxvk9oO h8PNZ5leln2Fxl6xAE9xFLDF8wTTORr3g7tpDjw9YY0XOSHxkr+k6dJR6w+MtXj/ A77cFKgSClSIDlGCWtAdIy10bQNuXKgt5/dRHoUyqTkcBMDwfpdXEL2N2TXtvPwK RLvQmkKmZaO+EAc4w5oagEFvTlOE3Le/atV6Ij2Osg7TNSScJtsJpRp6nPNMXZ8B pgG4ZXeRVfgUQlULpBAoSGeB5K76OxKwSH0Hg+5JFP3Hsmbm89r7W+PH/nypB0Ag uPWW1o+BXMDgqegcIN//zBNs9D3jrZN4TeB3UsxcNZCWOBUaNOGhAA/OzQ2WyTyg WXDAeO9Hf6CbgjUVovjNvhlTT/Kz/VXg0Wu4jk3dLxWaWfdUbNZYYrrXc5iTMmwr hSmrmmlAdcug9/BcjgryfJ2okNwMw4Mz4tpnQEUvBSa8AIKnmXa3qq5fZiYFufcu 3rPdR6G6vLI= =eqKv -----END PGP SIGNATURE-----