Published:2021/05/26 Last Updated:2021/06/02
JVN#98239374
Zettlr vulnerable to cross-site scripting
Overview
Zettlr contains a cross-site scripting vulnerability.
Products Affected
- Zettlr versions from 0.20.0 to 1.8.8
Description
Zettlr provided by Hendrik Erz is a Markdown editor. Zettlr contains a cross-site scripting vulnerability (CWE-79).
Impact
If a file or code snippet containing an invalid iframe is loaded into Zettlr, an arbitrary script may be executed on the system where it runs.
Solution
Update the Software
Update the software to the latest version according to the information provided by the developer.
Vendor Status
References
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
CVSS v3
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Base Score:
5.0
| 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:M/Au:N/C:N/I:P/A:N
Base Score:
4.3
| 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
Eiji Mori of flatt security Inc. 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-2021-20727 |
| JVN iPedia |
JVNDB-2021-000044 |
Update History
- 2021/05/28
- Fixed errors under the section [Products Affected] and [Impact].
- 2021/06/02
- Updated [Vendor Status].