VDB
CVE-2020-25683
CVE-2020-25683
PUBLISHED
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
EPSS 31.32% · 96.9th percentile
Risk Scores
EPSS Score
31.32%
96.9th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:14.04:LTS | dnsmasq | 2.68-1ubuntu0.2+esm2, 2.68-1, 2.68-1ubuntu0.1 |
| Ubuntu:20.04:LTS | dnsmasq | 2.80-1ubuntu2, 2.80-1.1ubuntu1, 2.80-1ubuntu4 |
| Ubuntu:18.04:LTS | dnsmasq | 0, 2.78-3, 2.79-1 |
| Ubuntu:16.04:LTS | dnsmasq | 2.75-1ubuntu0.16.04.3, 2.75-1ubuntu0.16.04.2, 2.75-1 |
Exploit Intelligence
- CIRCL seen: CVE-2020-25683 (circl-sighting)
- https://www.kb.cert.org/vuls/id/434904 (circl)
- https://www.jsof-tech.com/disclosures/dnspooq/ (circl)
- https://bugzilla.redhat.com/show_bug.cgi?id=1882018 (circl)
- FEDORA-2021-84440e87ba (circl)
- GLSA-202101-17 (circl)
- DSA-4844 (circl)
- FEDORA-2021-2e4c3d5a9d (circl)
- [debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update (circl)
Timeline
- Jan 18, 2021 CVE Published
- Jan 20, 2021 PoC Published
- Apr 14, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Mar 7, 2023 EPSS Score
- Aug 1, 2023 EPSS Score
- Aug 27, 2023 EPSS Score
- Oct 6, 2023 EPSS Score
- Nov 6, 2023 CVE Updated
- Nov 8, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-25683 third-party-advisory
- https://www.jsof-tech.com/disclosures/dnspooq/ third-party-advisory
- http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q1/014599.html third-party-advisory
- https://ubuntu.com/security/notices/USN-4698-1 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-25683 third-party-advisory