Bug 2048928 (CVE-2021-45955)

Summary: CVE-2021-45955 dnsmasq: heap-based buffer overflow in resize_packet
Product: [Other] Security Response Reporter: Marian Rehak <mrehak>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bdettelb, code, dbecker, dns-sig, dougsland, jburrell, jjoyce, jschluet, lhh, lpeer, mburns, pemensik, rschiron, sclewis, slinaber, tcullum, thoger, veillard, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
A heap-based out-of-bounds WRITE flaw was found in dnsmasq. A remote attacker who can trigger a packet resize can use this flaw to write up to 50 bytes to the heap via a memmove call.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2022-06-23 18:44:18 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2048929, 2090008, 2090009, 2090010, 2090011, 2090012, 2090013, 2090014, 2090015    
Bug Blocks: 2048923    

Description Marian Rehak 2022-02-01 08:23:33 UTC 
Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c).

Reference:

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898
Comment 1 Marian Rehak 2022-02-01 08:23:49 UTC 
Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 2048929]