Input validation error in pdns-recursor (Alpine package)
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-10995 |
| CWE-ID | CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
pdns-recursor (Alpine package) Operating systems & Components / Operating system package or component |
| Vendor | Alpine Linux Development Team |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Input validation error
EUVDB-ID: #VU28141
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-10995
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input when processing DNS responses. A remote attacker who controls a malicious DNS server can send a specially crafted response and perform a denial of service (DoS) attack against third-party DNS servers.
The attack is triggered by random subdomains in the NSDNAME in NS records.
MitigationInstall update from vendor's website.
Vulnerable software versionspdns-recursor (Alpine package): 4.1.1-r0 - 4.1.14-r1
External linkshttp://git.alpinelinux.org/aports/commit/?id=5dcc709a2d71bb5090c2fdd2a78cab88d6395f1d
http://git.alpinelinux.org/aports/commit/?id=d863fb499f4f3c153298e54046738251d8fc1af5
http://git.alpinelinux.org/aports/commit/?id=fbfc29c6a052ada4d472ae1f42542c49ee9c5f86
http://git.alpinelinux.org/aports/commit/?id=b553aeeff9686aba5ada03399a14cd82d7675db3
http://git.alpinelinux.org/aports/commit/?id=4f995056d1cc52e27ae67abc42e4a53789c45fe2
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
