Out-of-Bounds Write in Unbound DNS Resolver by NLnet Labs
CVE-2019-25035

9.8CRITICAL

Key Information:

Vendor

Nlnetlabs

Status
Unbound
Vendor
CVE Published:
27 April 2021

What is CVE-2019-25035?

Unbound versions prior to 1.9.5 have a coding flaw that allows for an out-of-bounds write in the function sldns_bget_token_par. Although the vendor contests the classification of this as a significant vulnerability, it is essential to note that the code’s design does not permit remote or local attacks on a running Unbound installation. Users should still be aware of this potential weakness and consider upgrading to mitigate any risks.

References

https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-f...
x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021/05/msg0...
mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-20210507-0007/
x_refsource_CONFIRM

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.