Bug 1226353 - VUL-0: CVE-2024-35325: python-ruamel.yaml: libyaml: double-free in yaml_event_delete in /src/libyaml/src/api.c
Summary: VUL-0: CVE-2024-35325: python-ruamel.yaml: libyaml: double-free in yaml_event...
Status: IN_PROGRESS
Alias: None
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Major
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/410664/
Whiteboard:
Keywords:
Depends on:
Blocks: CVE-2024-35325
  Show dependency tree / graph
 
Reported: 2024-06-14 14:04 UTC by Camila Camargo de Matos
Modified: 2024-07-01 06:41 UTC (History)
4 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Camila Camargo de Matos 2024-06-14 14:04:09 UTC 
+++ This bug was initially created as a clone of Bug #1226342 +++

A vulnerability was found in libyaml up to 0.2.5. Affected by this issue is the function yaml_event_delete of the file /src/libyaml/src/api.c. The manipulation leads to a double-free.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-35325
https://www.cve.org/CVERecord?id=CVE-2024-35325
https://github.com/idhyt/pocs/blob/main/libyaml/CVE-2024-35325.c
https://bugzilla.redhat.com/show_bug.cgi?id=2292350
Comment 1 Camila Camargo de Matos 2024-06-14 17:11:41 UTC 
See bug #1226342 for a reference link which is the upstream GitHub issue where this possible vulnerability is being discussed.
Comment 3 Daniel Garcia 2024-06-18 11:31:23 UTC 
Possibly not a bug, upstream discussion can be found here:
https://github.com/yaml/libyaml/issues/298
Comment 4 Daniel Garcia 2024-06-26 08:11:23 UTC 
The code snippet uses the API in a wrong way, calling yaml_event_delete which shouldn't be called. The correct usage is documented here: https://pyyaml.org/wiki/LibYAML
In the emitter example there is no usage of yaml_event_delete.
yaml_emitter_delete will delete the events itself.

See the discussion here:
https://github.com/yaml/libyaml/issues/297

I've reviewed the embed code in the SUSE:SLE-12:Update package and is not affected at all because it is using the API in the correct way.