Bug 1919912 (CVE-2020-26418) - CVE-2020-26418 wireshark: Kafka dissector memory leak (wnpa-sec-2020-16)
Summary: CVE-2020-26418 wireshark: Kafka dissector memory leak (wnpa-sec-2020-16)
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-26418
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1919913 1924649
Blocks: 1919925
TreeView+ depends on / blocked
 
Reported: 2021-01-25 11:50 UTC by Dhananjay Arunesh
Modified: 2021-09-28 17:02 UTC (History)
9 users (show)

Fixed In Version: wireshark 3.2.9, wireshark 3.4.1
Doc Type: If docs needed, set a value
Doc Text:
A flaw was discovered in the Apache Kafka protocol dissector of Wireshark while decoding packets captured in a pcap file or coming from the network. A remote attacker may abuse this flaw by sending specially crafted packets that, when processed, would potentially make Wireshark crash resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-06-29 20:58:01 UTC
Embargoed:


Attachments (Terms of Use)

Comment 1 Dhananjay Arunesh 2021-01-25 11:51:55 UTC
Created wireshark tracking bugs for this issue:

Affects: fedora-all [bug 1919913]

Comment 3 Mauro Matteo Cascella 2021-02-01 10:24:26 UTC
External References:

https://www.wireshark.org/security/wnpa-sec-2020-16

Comment 4 Mauro Matteo Cascella 2021-02-01 14:31:58 UTC
Statement:

This issue does not affect the versions of `wireshark` as shipped with Red Hat Enterprise Linux 5, 6, and 7, as they did not include support for the Apache Kafka dissector.

Comment 5 Mauro Matteo Cascella 2021-02-03 11:09:23 UTC
More of a memory leak, I'd rather consider this bug to be an improper validation of the decompression size (while decoding packets captured in a pcap file or coming from the network) leading to an assertion failure and possible crash. Among other things, the patch checks the 'length' argument of decompress() in epan/dissectors/packet-kafka.c.

---
#define MAX_DECOMPRESSION_SIZE (50 * 1000 * 1000) // Arbitrary
if (length > MAX_DECOMPRESSION_SIZE) {
    expert_add_info(pinfo, NULL, &ei_kafka_bad_decompression_length);
    return FALSE;
}


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