CVE-2020-15275: malicious SVG attachment causing stored XSS vulnerability in MoinMoin
First published: Wed Nov 11 2020(Updated: )
### Impact An attacker with `write` permissions can upload an SVG file that contains malicious javascript. This javascript will be executed in a user's browser when the user is viewing that SVG file on the wiki. ### Patches Users are strongly advised to upgrade to a patched version. MoinMoin Wiki 1.9.11 has the necessary fixes and also contains other important fixes. ### Workarounds It is not advised to work around this, but to upgrade MoinMoin to a patched version. That said, a work around via a Content Security Policy in the web server might be possible. Also, it is of course helpful if you give `write` permissions (which include uploading attachments) only to trusted users. ### For more information If you have any questions or comments about this advisory, email me at [twaldmann@thinkmo.de](mailto:twaldmann@thinkmo.de). ### Credits This vulnerability was discovered by: Catarina Leite from the Checkmarx SCA AppSec team
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/moin | 1.9.9-1+deb10u1 | |
| pip/moin | <1.9.11 | 1.9.11 |
| MoinMoin | <1.9.11 |
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Reference Links
- https://github.com/moinwiki/moin-1.9/security/advisories/GHSA-4q96-6xhq-ff43
- https://github.com/moinwiki/moin-1.9/commit/64e16037a60646a4d834f0203c75481b9c3fa74c
- https://security-tracker.debian.org/tracker/CVE-2020-15275
- https://advisory.checkmarx.net/advisory/CX-2020-4285
- https://github.com/moinwiki/moin-1.9/commit/31de9139d0aabc171e94032168399b4a0b2a88a2
- https://github.com/moinwiki/moin-1.9/releases/tag/1.9.11
- https://nvd.nist.gov/vuln/detail/CVE-2020-15275
- https://github.com/pypa/advisory-database/tree/main/vulns/moin/PYSEC-2020-241.yaml
- https://pypi.org/project/moin
- https://github.com/advisories/GHSA-4q96-6xhq-ff43 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2020-15275?
CVE-2020-15275 is classified as a high-severity vulnerability due to its potential for remote code execution via malicious SVG files.
How do I fix CVE-2020-15275?
To fix CVE-2020-15275, upgrade to version 1.9.9-1+deb10u1 for Debian or version 1.9.11 for pip installations of Moin.
What types of software are affected by CVE-2020-15275?
CVE-2020-15275 affects MoinMoin versions prior to 1.9.9-1+deb10u1 and 1.9.11 in pip installations.
What actions can an attacker take by exploiting CVE-2020-15275?
An attacker can upload an SVG file with malicious JavaScript that executes in users' browsers when viewing the file.
Who should be concerned about CVE-2020-15275?
Users and administrators of MoinMoin sites should be concerned about CVE-2020-15275, especially those with write permissions.
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