Security restrictions bypass in pdns-recursor (Alpine package)

1) Security restrictions bypass

EUVDB-ID: #VU17347

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3806

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to Lua hooks are not properly applied to queries received over TCP in some specific combination of settings. A remote attacker can bypass security policies enforced using Lua.

Mitigation

Install update from vendor's website.

Vulnerable software versions

pdns-recursor (Alpine package): 4.1.7-r0 - 4.1.8-r0

External links

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=2632d6c9a7012a1a341ebb59d60353242988c20a
http://git.alpinelinux.org/aports/commit/?id=f2ae078758a3a6a9ba1068bf9d79123f305d54f8
http://git.alpinelinux.org/aports/commit/?id=6a3fa7f0de2ead28d97544145519442677781eb3
http://git.alpinelinux.org/aports/commit/?id=785c236c3e5b8ea124110f2d4a39772bc09ec8e0

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.