Bug 1954796 (CVE-2019-25038) - CVE-2019-25038 unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c
Summary: CVE-2019-25038 unbound: integer overflow in a size calculation in dnscrypt/dn...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-25038
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: Red Hat1859933 Red Hat1968662 Red Hat1968663 Red Hat1968664
Blocks: Embargoed1954811
TreeView+ depends on / blocked
 
Reported: 2021-04-28 19:06 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-02-22 15:13 UTC (History)
5 users (show)

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 dnsc_load_local_data function may lead to a buffer overflow of the allocated buffer 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.
Clone Of:
Environment:
Last Closed: 2021-05-18 20:39:10 UTC

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:0632 0 None None None 2022-02-22 15:13:54 UTC

Description Guilherme de Almeida Suckevicz 2021-04-28 19:06:22 UTC 
Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c.

Reference:
https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
Comment 1 Riccardo Schirone 2021-05-06 11:32:12 UTC 
Upstream patch:
https://github.com/NLnetLabs/unbound/commit/02080f6b180232f43b77f403d0c038e9360a460f
Comment 3 Riccardo Schirone 2021-05-06 14:53:13 UTC 
Statement:

There is no available reproducer or proof of concept for this issue, nor it was ever proven the integer overflow can lead to a buffer overflow in practice. Indeed in the original report this issue was considered one that might not be triggered and for this reason its Impact is Moderate.
Comment 5 errata-xmlrpc 2021-05-18 15:37:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1853 https://access.redhat.com/errata/RHSA-2021:1853
Comment 6 Product Security DevOps Team 2021-05-18 20:39:10 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-2019-25038
Comment 8 errata-xmlrpc 2022-02-22 15:13:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2022:0632 https://access.redhat.com/errata/RHSA-2022:0632
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