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8.1	$0-$5k	0.00

A vulnerability classified as critical has been found in ISC BIND up to 9.17.1 (Domain Name Software). This affects an unknown code of the component Fetch Handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.

The weakness was shared 05/19/2020 (oss-sec). It is possible to read the advisory at openwall.com. The advisory contains:

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.

This vulnerability is uniquely identified as CVE-2020-8616 since 02/05/2020. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

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. In its original design BIND (as well as other nameservers) does not sufficiently limit the number of fetches which may be performed while processing a referral response.

Upgrading to version 9.11.19, 9.14.12 or 9.16.3 eliminates this vulnerability.

The entry 155440 is related to this item.

Productinfo

Type

• Domain Name Software

Vendor

• ISC

Name

• BIND

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.11.0
• 9.11.1
• 9.11.2
• 9.11.3
• 9.11.4
• 9.11.5
• 9.11.6
• 9.11.7
• 9.11.8
• 9.11.9
• 9.11.10
• 9.11.11
• 9.11.12
• 9.11.13
• 9.11.14
• 9.11.15
• 9.11.16
• 9.11.17
• 9.11.18
• 9.12
• 9.12.4-P2
• 9.13
• 9.14
• 9.14.0
• 9.14.1
• 9.14.2
• 9.14.3
• 9.14.4
• 9.14.5
• 9.14.6
• 9.14.7
• 9.14.8
• 9.14.9
• 9.14.10
• 9.14.11
• 9.15
• 9.16.0
• 9.16.1
• 9.16.2
• 9.17.0
• 9.17.1

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.3
VulDB Temp Score: 7.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (ISC): 8.6
Vendor Vector (ISC): 🔍

NVD Base Score: 8.6
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: BIND 9.11.19/9.14.12/9.16.3

Timelineinfo

02/05/2020 🔍
05/19/2020 +104 days 🔍
05/20/2020 +1 days 🔍
10/18/2020 +151 days 🔍

Sourcesinfo

Vendor: isc.org

Advisory: openwall.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-8616 (🔍)
See also: 🔍

Entryinfo

Created: 05/20/2020 06:31
Updated: 10/18/2020 19:16
Changes: 05/20/2020 06:31 (52), 05/20/2020 06:36 (12), 10/18/2020 19:16 (1)
Complete: 🔍

Discussion

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