ISC BIND up to 9.8.8/9.9.7-P2/9.10.2-P3 OpenPGP Key openpgpkey_61.c input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.6$0-$5k0.00

Summaryinfo

A vulnerability was found in ISC BIND up to 9.8.8/9.9.7-P2/9.10.2-P3. It has been declared as problematic. This affects an unknown part of the file openpgpkey_61.c of the component OpenPGP Key Handler. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2015-5986. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in ISC BIND up to 9.8.8/9.9.7-P2/9.10.2-P3 (Domain Name Software). It has been rated as problematic. Affected by this issue is some unknown processing of the file openpgpkey_61.c of the component OpenPGP Key Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. CVE summarizes:

openpgpkey_61.c in named in ISC BIND 9.9.7 before 9.9.7-P3 and 9.10.x before 9.10.2-P4 allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) via a crafted DNS response.

The weakness was disclosed 09/02/2015 as AA-01291 as confirmed security advisory (Website). The advisory is shared for download at kb.isc.org. The public release has been coordinated in cooperation with the vendor. This vulnerability is handled as CVE-2015-5986 since 08/13/2015. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The advisory points out:

An incorrect boundary check in openpgpkey_61.c can cause named to terminate due to a REQUIRE assertion failure. This defect can be deliberately exploited by an attacker who can provide a maliciously constructed response in answer to a query. (...) A server which encounters this error will terminate due to a REQUIRE assertion failure, resulting in denial of service to clients. Recursive servers are at greatest risk from this defect but some circumstances may exist in which the attack can be successfully exploited against an authoritative server.

The vulnerability was handled as a non-public zero-day exploit for at least 14 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 85775 (FreeBSD : bind -- denial of service vulnerability (2c5e7e23-5248-11e5-9ad8-14dae9d210b8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 124138 (Fedora Security Update for bind99 (FEDORA-2015-14958, FEDORA-2015-14954)).

Upgrading to version 9.9.8rc1 or 9.10.3rc1 eliminates this vulnerability. Applying the patch 9.9.7-P3/9.10.2-P4 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 21436.

The vulnerability is also documented in the databases at X-Force (106090), Tenable (85775), SecurityFocus (BID 76618†), SecurityTracker (ID 1033453†) and Vulnerability Center (SBV-53760†). The entry VDB-77551 is pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 85775
Nessus Name: FreeBSD : bind -- denial of service vulnerability (2c5e7e23-5248-11e5-9ad8-14dae9d210b8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 18627
OpenVAS Name: Gentoo Linux Local Check: https://security.gentoo.org/glsa/201510-01
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: BIND 9.9.8rc1/9.10.3rc1
Patch: 9.9.7-P3/9.10.2-P4
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍

Timelineinfo

08/13/2015 🔍
08/19/2015 +6 days 🔍
09/02/2015 +14 days 🔍
09/02/2015 +0 days 🔍
09/02/2015 +0 days 🔍
09/03/2015 +1 days 🔍
09/04/2015 +1 days 🔍
10/21/2015 +47 days 🔍
10/22/2015 +1 days 🔍
06/14/2022 +2427 days 🔍

Sourcesinfo

Vendor: isc.org

Advisory: AA-01291
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2015-5986 (🔍)
GCVE (CVE): GCVE-0-2015-5986
GCVE (VulDB): GCVE-100-77552
X-Force: 106090 - ISC BIND openpgpkey_61.c denial of service
SecurityFocus: 76618
SecurityTracker: 1033453
Vulnerability Center: 53760 - Bind 9.9.7 before 9.7.7-P3 and 9.10 before 9.10.2-P4 Remote DoS via a Crafted DNS Response, High

See also: 🔍

Entryinfo

Created: 09/03/2015 12:45
Updated: 06/14/2022 08:46
Changes: 09/03/2015 12:45 (83), 02/15/2018 11:09 (6), 06/14/2022 08:46 (3)
Complete: 🔍
Cache ID: 216:5D4:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!