Bug 1536921 (CVE-2018-5773) - CVE-2018-5773 python-markdown2: Unsanitized input in markdown() method allows for cross-site scripting (XSS)
Summary: CVE-2018-5773 python-markdown2: Unsanitized input in markdown() method allows...
Alias: CVE-2018-5773
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1536922 1536923
Blocks: 1536925
TreeView+ depends on / blocked
Reported: 2018-01-22 03:28 UTC by Sam Fowler
Modified: 2019-09-29 14:30 UTC (History)
1 user (show)

Fixed In Version:
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Clone Of:
Last Closed: 2019-06-08 03:37:46 UTC

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Description Sam Fowler 2018-01-22 03:28:44 UTC
An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final '>' character from an IMG tag.

External References:

Upstream Issue:

Comment 1 Sam Fowler 2018-01-22 03:29:16 UTC
Created python-markdown2 tracking bugs for this issue:

Affects: epel-all [bug 1536922]
Affects: fedora-all [bug 1536923]

Comment 2 Product Security DevOps Team 2019-06-08 03:37:46 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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