Bug 1954775 (CVE-2019-25033)

Summary:	CVE-2019-25033 unbound: integer overflow in the regional allocator via the ALIGN_UP macro
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aegorenk, akhaitovich, paul.wouters, pemensik, pj.pandit
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	unbound 1.9.6	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in unbound. An integer overflow in the regional allocator via the ALIGN_UP macro may lead to a buffer overflow if the size can be controlled by an attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 12:26:13 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:	1957801
Bug Blocks:	1954811

Description Guilherme de Almeida Suckevicz 2021-04-28 18:39:59 UTC

Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro.

Reference:
https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/

Comment 1 Riccardo Schirone 2021-05-06 10:56:36 UTC

Upstream patches:
https://github.com/NLnetLabs/unbound/commit/09707fc403a7e0d7f5ef0029c597c2645ba49dd5
https://github.com/NLnetLabs/unbound/commit/226298bbd36f1f0fd9608e98c2ae85988b7bbdb8

Comment 4 Riccardo Schirone 2021-05-06 14:50:04 UTC

Statement:

There is no available reproducer or proof of concept for this issue, nor it was ever proven the buffer overflow can happen in practice. Indeed this issue was initially considered just as "side-finding", according to the original report, and for this reason its Impact is Moderate.

Comment 7 errata-xmlrpc 2024-02-08 18:03:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0749 https://access.redhat.com/errata/RHSA-2024:0749