Home/CVE/Apple iOS Webkit Memory Corruption Vulnerability
CVE

CVE-2016-4657

Apple iOS Webkit Memory Corruption Vulnerability

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

HIGH · CVSS 8.8 ⚠ CISA KEV EPSS 0.79432
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  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

1
actorNSO Group / Pegasus
⬡

Weakness Classification

CWE-787Out-of-bounds Write
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

1
apple iphone os< 9.3.5
⚠

Public Exploits & PoCs

4
remoteWebKit - not_number defineProperties UAF (Metasploit)verified
dosNintendo Switch - WebKit Code Execution (PoC)2017-03-12
pocwww.exploit-db.com · 44836www.exploit-db.com
pocwww.youtube.com · watch?v=xkdPjbaLngEwww.youtube.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Possible iOS Pegasus Safari Exploit (CVE-2016-4657)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalRenamed Whoami Execution
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · product-security@apple.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Aug 2016 · 09:59 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2016-4657
usnUSN-3166-1
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken LinkMailing ListVendor Advisory
http://www.securityfocus.com/bid/92653Broken LinkThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1036694Broken LinkThird Party AdvisoryVDB Entry
https://blog.lookout.com/blog/2016/08/25/trident-pegasus/Broken Link
https://support.apple.com/HT207107Release NotesVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657US Government Resource
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