Published:2018/11/02 Last Updated:2018/11/02
JVN#96551318
Mail app for iOS vulnerable to denial-of-service (DoS)
Overview
Mail app for iOS contains a denial-of-service (DoS) vulnerability.
Products Affected
- Mail app for iOS
Description
Mail app for iOS provided by Apple contains a denial-of-service (DoS) vulnerability due to an issue in the handling of a maliciously crafted S/MIME signed message.
Impact
Mail app may continuously crash when a maliciously crafted S/MIME signed message is listed on it.
Solution
Update iOS
Update iOS to the latest version according to the information provided by the developer.
Vendor Status
| Vendor | Link |
| Apple | Apple security updates |
| About the security content of iOS 12.1 |
References
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
CVSS v3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score:
7.5
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
CVSS v2
AV:N/AC:L/Au:N/C:N/I:N/A:P
Base Score:
5.0
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Credit
Yukinobu Nagayasu of LAC Co., Ltd. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2018-4400 |
| JVN iPedia |
JVNDB-2018-000116 |