Bug 1954778 (CVE-2019-25034) - CVE-2019-25034 unbound: integer overflow in sldns_str2wire_dname_buf_origin can lead to an out-of-bounds write
Summary: CVE-2019-25034 unbound: integer overflow in sldns_str2wire_dname_buf_origin c...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-25034
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: 1859933 1968662 1968663 1968664
Blocks: 1954811
TreeView+ depends on / blocked
 
Reported: 2021-04-28 18:42 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 the sldns_str2wire_dname_buf_origin function may lead to a buffer overflow. 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 20:38:57 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 15:13:40 UTC

Description Guilherme de Almeida Suckevicz 2021-04-28 18:42:37 UTC 
Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading to an out-of-bounds write.

Reference:
https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
Comment 1 Riccardo Schirone 2021-05-06 11:03:56 UTC 
Upstream patch:
https://github.com/NLnetLabs/unbound/commit/a3545867fcdec50307c776ce0af28d07046a52dd
Comment 3 Riccardo Schirone 2021-05-06 14:50:57 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 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 15:37:40 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 20:38:57 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-2019-25034
Comment 7 Product Security DevOps Team 2021-05-19 02:33:49 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-2019-25034
Comment 9 errata-xmlrpc 2022-02-22 15:13:37 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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