Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading to an out-of-bounds write. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/ | third party advisory patch |
| https://lists.debian.org/debian-lts-announce/2021/05/msg00007.html | third party advisory mailing list |
| https://security.netapp.com/advisory/ntap-20210507-0007/ | third party advisory |