Bug 1886051 (CVE-2020-25866) - CVE-2020-25866 wireshark: BLIP dissector crash (wnpa-sec-2020-13)
Summary: CVE-2020-25866 wireshark: BLIP dissector crash (wnpa-sec-2020-13)
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25866
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: 1886052
Blocks: 1886053
TreeView+ depends on / blocked
 
Reported: 2020-10-07 14:35 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 19:08 UTC (History)
9 users (show)

Fixed In Version: wireshark 3.0.7, wireshark 3.0.14
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Last Closed: 2020-10-08 02:21:21 UTC
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Description Guilherme de Almeida Suckevicz 2020-10-07 14:35:37 UTC 
In Wireshark 3.2.0 to 3.2.6 and 3.0.0 to 3.0.13, the BLIP protocol dissector has a NULL pointer dereference because a buffer was sized for compressed (not uncompressed) messages. This was addressed in epan/dissectors/packet-blip.c by allowing reasonable compression ratios and rejecting ZIP bombs.

References:
https://www.wireshark.org/security/wnpa-sec-2020-13.html
https://gitlab.com/wireshark/wireshark/-/issues/16866

Upstream patch:
https://gitlab.com/wireshark/wireshark/-/commit/4a948427100b6c109f4ec7b4361f0d2aec5e5c3f
Comment 1 Guilherme de Almeida Suckevicz 2020-10-07 14:36:13 UTC 
Created wireshark tracking bugs for this issue:

Affects: fedora-all [bug 1886052]
Comment 2 Todd Cullum 2020-10-07 21:45:20 UTC 
Statement:

Wireshark as shipped with Red Hat Enterprise Linux 5, 6, 7, and 8 is not affected because the versions shipped do not contain the BLIP dissector.
Comment 3 Todd Cullum 2020-10-07 22:05:11 UTC 
Flaw summary:

The BLIP dissector causes a crash when uncompressed messages > 16kb are provided. The patch has increased this size to 64kb and if the dissector fails, an error message displayed rather than a crash of Wireshark.
Comment 5 Product Security DevOps Team 2020-10-08 02:21:21 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25866
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