GHSA-pcf2-gh6g-h5r2

Source

https://github.com/advisories/GHSA-pcf2-gh6g-h5r2

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/10/GHSA-pcf2-gh6g-h5r2/GHSA-pcf2-gh6g-h5r2.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-pcf2-gh6g-h5r2

Aliases

CVE-2023-43643

Published

2023-10-09T00:42:27Z

Modified

2024-02-16T08:06:43.223770Z

Severity

6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator

Summary

mXSS in AntiSamy

Details

Impact

There is a potential for a mutation XSS (mXSS) vulnerability in AntiSamy caused by flawed parsing of the HTML being sanitized. To be subject to this vulnerability the preserveComments directive must be enabled in your policy file and also allow for certain tags at the same time. As a result, certain crafty inputs can result in elements in comment tags being interpreted as executable when using AntiSamy's sanitized output.

Patches

Patched in AntiSamy 1.7.4 and later. See important remediation details in the reference given below.

Workarounds

If you cannot upgrade to a fixed version of the library, the following mitigation can be applied until you can upgrade: Manually edit your AntiSamy policy file (e.g., antisamy.xml) by deleting the preserveComments directive or setting its value to false, if present. Also it would be useful to make AntiSamy remove the noscript tag by adding this in your tag definitions under the <tagrules> node (or deleting it entirely if present):

<tag name="noscript" action="remove"/>

As the previously mentioned policy settings are preconditions for the mXSS attack to work, changing them as recommended should be sufficient to protect you against this vulnerability when using a vulnerable version of this library. However, the existing bug would still be present in AntiSamy or its parser dependency (neko-htmlunit). The safety of this workaround relies on configurations that may change in the future and don't address the root cause of the vulnerability. As such, it is strongly recommended to upgrade to a fixed version of AntiSamy.

For more information

If you have any questions or comments about this advisory:

Email one of the project co-leaders, listed on the OWASP AntiSamy project page, under "Leaders".

Database specific

{
    "nvd_published_at": "2023-10-09T14:15:10Z",
    "cwe_ids": [
        "CWE-79"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2023-10-09T00:42:27Z"
}

References

Affected packages

Maven / org.owasp.antisamy:antisamy

Package

Name: org.owasp.antisamy:antisamy; View open source insights on deps.dev
Purl: pkg:maven/org.owasp.antisamy/antisamy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.7.4

Affected versions

1.*

1.4.2

1.4.3

1.4.4

1.4.5

1.5

1.5.1

1.5.2

1.5.3

1.5.5

1.5.6

1.5.7

1.5.8

1.5.9

1.5.10

1.5.11

1.5.12

1.5.13

1.6.0

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

1.6.6

1.6.6.1

1.6.7

1.6.8

1.7.0

1.7.1

1.7.2

1.7.3

Database specific

{
    "last_known_affected_version_range": "<= 1.7.3"
}