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...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2018-5773
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
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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)

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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:
https://nvd.nist.gov/vuln/detail/CVE-2018-5773

Upstream Issue:
https://github.com/trentm/python-markdown2/issues/285
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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