Reachable Assertion in ISC BIND - CVE-2020-8618
Published: June 22, 2020
Vulnerability identifier: #VU29184
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8618
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion in rdataset.c when processing large responses during zone transfers. A remote attacker with ability to send zone data to a server via zone transfer can exploit this to intentionally trigger memory corruption and assertion failure with a specially constructed zone, denying service to clients.
Affected software
ISC BIND
Arch Linux
Opensuse
bind (Alpine package)
Arch Linux
Opensuse
bind (Alpine package)
How to mitigate CVE-2020-8618
Install updates from vendor's website.
ISC BIND - addressed in versions 9.11.19, 9.11.19-S1, 9.14.12, 9.16.3
bind (Alpine package) - update to 9.16.5-r0
bind (Alpine package) - update to 9.16.5-r0