Bug 1886044 (CVE-2020-25863) - CVE-2020-25863 wireshark: MIME multipart dissector crash (wnpa-sec-2020-11)
Summary: CVE-2020-25863 wireshark: MIME multipart dissector crash (wnpa-sec-2020-11)
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-25863
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1886045 1886199
Blocks: 1886053
TreeView+ depends on / blocked
 
Reported: 2020-10-07 14:28 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-06-29 20:50 UTC (History)
9 users (show)

Fixed In Version: wireshark 3.2.7, wireshark 3.0.14
Clone Of:
Environment:
Last Closed: 2021-06-29 20:50:36 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-10-07 14:28:06 UTC 
In Wireshark 3.2.0 to 3.2.6, 3.0.0 to 3.0.13, and 2.6.0 to 2.6.20, the MIME Multipart dissector could crash. This was addressed in epan/dissectors/packet-multipart.c by correcting the deallocation of invalid MIME parts.

References:
https://www.wireshark.org/security/wnpa-sec-2020-11.html
https://gitlab.com/wireshark/wireshark/-/issues/16741

Upstream patch:
https://gitlab.com/wireshark/wireshark/-/commit/5803c7b87b3414cdb8bf502af50bb406ca774482
Comment 1 Guilherme de Almeida Suckevicz 2020-10-07 14:28:32 UTC 
Created wireshark tracking bugs for this issue:

Affects: fedora-all [bug 1886045]
Comment 4 Todd Cullum 2020-10-07 22:01:19 UTC 
Flaw summary:

get_multipart_info() in epan/dissectors/packet-multipart.c attempts to free start_boundary even if it points to an invalid address. The patch sets start_boundary to NULL in this case rather than attempting to free it.
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