Out-of-bounds read in pdns-recursor (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU28143

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-10030

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when processing a hostname via the gethostname()  function. A local user with ability to change system hostname can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

pdns-recursor (Alpine package): 4.1.1-r0 - 4.1.14-r1

CPE2.3

• cpe:2.3:a:alpine:pdns-recursor_alpine_package:4.1.1-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:a:alpine:pdns-recursor_alpine_package:4.1.1-r1:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:a:alpine:pdns-recursor_alpine_package:4.1.2-r0:*:*:*:*:alpine_linux:*:3.7

External links

https://git.alpinelinux.org/aports/commit/?id=d863fb499f4f3c153298e54046738251d8fc1af5
https://git.alpinelinux.org/aports/commit/?id=fbfc29c6a052ada4d472ae1f42542c49ee9c5f86

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.