Bug 2189103 (CVE-2021-46878) - CVE-2021-46878 fluent-bit: type confusion causing use-after-free in flb_pack_msgpack_to_json_format
Summary: CVE-2021-46878 fluent-bit: type confusion causing use-after-free in flb_pack_...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-46878
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2189104 2189105
Blocks: 2186018
TreeView+ depends on / blocked
 
Reported: 2023-04-24 08:35 UTC by Anten Skrabec
Modified: 2023-04-24 13:15 UTC (History)
0 users

Fixed In Version:
Doc Type: ---
Doc Text:
The package fluent-bit is vulnerable to a Use After Free due to erroneous parsing in the flb_pack_msgpack_to_json_format() function, which leads to type confusion.
Clone Of:
Environment:
Last Closed: 2023-04-24 13:15:05 UTC
Embargoed:

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Description Anten Skrabec 2023-04-24 08:35:25 UTC 
An issue was discovered in Treasure Data Fluent Bit 1.7.1, erroneous parsing in flb_pack_msgpack_to_json_format leads to type confusion bug that interprets whatever is on the stack as msgpack maps and arrays, leading to use-after-free. This can be used by an attacker to craft a specially craft file and trick the victim opening it using the affect software, triggering use-after-free and execute arbitrary code on the target system.
Comment 1 Anten Skrabec 2023-04-24 08:35:40 UTC 
Created fluent-bit tracking bugs for this issue:

Affects: epel-8 [bug 2189105]
Affects: fedora-all [bug 2189104]
Comment 2 Product Security DevOps Team 2023-04-24 13:15:03 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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