Race condition in bind (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-6471
CWE-ID CWE-362
Exploitation vector Network
Public exploit N/A
Vulnerable software
 bind (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) Race condition

EUVDB-ID: #VU21568

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-6471

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a race condition when processing DNS requests in dispatch.c. A remote attacker can send specially crafted DNS packets to the affected daemon, trigger a REQUIRE assertion failure and crash the DNS server.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.11.1-r0 - 9.11.6_p1-r1

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=5f63a5fe529bbf21d6df33b174df042d09bc53c3
https://git.alpinelinux.org/aports/commit/?id=0114ee65efba18fb076f02326482b48b4b8f9e1a
https://git.alpinelinux.org/aports/commit/?id=2174faf01b79aad83a3e79d89fb186a526fe6085
https://git.alpinelinux.org/aports/commit/?id=0e9f47894fe8db4e30f0957eb40fb7a46e92eeec
https://git.alpinelinux.org/aports/commit/?id=98759ce1129fb6f2b1f25f89e483839e357a8e43


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.



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