SB2020052039 - Resource management error in bind (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) Resource management error (CVE-ID: CVE-2020-8616)

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

The vulnerability exists due to improper management of internal resources with the applicatoin. In order for a server performing recursion to locate records in the DNS graph it must be capable of processing referrals, such as those received when it attempts to query an authoritative server for a record which is delegated elsewhere. A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=9fd4335a39b73f3ab692a227e470c31d0fc161b1
• https://git.alpinelinux.org/aports/commit/?id=54d9d7620b3c43d194b0db4a84b55f3def94cd75
• https://git.alpinelinux.org/aports/commit/?id=f415ad5b8bc9e3fb57d3f950785b0203d7eee934
• https://git.alpinelinux.org/aports/commit/?id=ff7db7c636342b669dde2b034e9c8c887cb9ee90