Bug 2048925 (CVE-2021-45956) - CVE-2021-45956 dnsmasq: a heap-based buffer overflow in print_mac
Summary: CVE-2021-45956 dnsmasq: a heap-based buffer overflow in print_mac
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-45956
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: 2048926
Blocks: 2048923
TreeView+ depends on / blocked
 
Reported: 2022-02-01 08:17 UTC by Marian Rehak
Modified: 2023-03-14 10:13 UTC (History)
16 users (show)

Fixed In Version:
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Last Closed: 2022-05-24 23:36:43 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Github google oss-fuzz pull 7293 0 None open Attempt to fix insufficient extract_name buffer 2022-02-16 23:35:52 UTC
chromium.org oss-fuzz 35887 0 None None None 2022-02-16 23:35:52 UTC

Description Marian Rehak 2022-02-01 08:17:18 UTC 
Dnsmasq 2.86 has a heap-based buffer overflow in print_mac (called from log_packet and dhcp_reply).

Reference:

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-933.yaml
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35887
Comment 1 Marian Rehak 2022-02-01 08:18:21 UTC 
Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 2048926]
Comment 3 Petr Menšík 2022-02-16 23:35:52 UTC 
Because print_mac also uses daemon->namebuff as printout buffer, I expect this is too related to extract_name fixes. After applying PR [1] I were unable to reproduce this issue anymore. It seems to be related, probably this is also bogus issue.

1. https://github.com/google/oss-fuzz/pull/7293
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