Out-of-bounds Read in Powerdns Recursor
CVE-2020-10030
An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.239 (97.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.239 · newest: 0.239 · change: 0.000
Affected products
Weakness classification (CWE)
References
- doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-03.html (Vendor Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-05/msg00052.html (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-10030?
- CVE-2020-10030 is a high-severity vulnerability in Powerdns Recursor, classified under Out-of-bounds Read. CVSS score: 8.8/10. Published 2020-05-19.
- How severe is CVE-2020-10030?
- High severity. CVSS v3 base score is 8.8 out of 10.