GNU C Library DNS Response dns-host.c getanswer_r memory corruption

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CTI Interest Score
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A vulnerability was found in GNU C Library (Software Library) (the affected version unknown) and classified as critical. Affected by this issue is the function getanswer_r of the file /resolv/nss_dns/dns-host.c of the component DNS Response Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 04/21/2015 with Red Hat as confirmed patch (Website). The advisory is shared for download at This vulnerability is handled as CVE-2015-1781 since 02/17/2015. 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 vulnerability scanner Nessus provides a plugin with the ID 83865 (Debian DLA-230-1 : eglibc security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196484 (Ubuntu Security Notification for Eglibc, Glibc Vulnerabilities (USN-2985-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 19687.

The vulnerability is also documented in the databases at Tenable (83865), SecurityFocus (BID 74255†), SecurityTracker (ID 1032178†) and Vulnerability Center (SBV-49835†).






CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
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Class: Memory corruption
CWE: CWE-119

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 83865
Nessus Name: Debian DLA-230-1 : eglibc security update
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OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2015-617
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02/17/2015 🔍
04/21/2015 +63 days 🔍
04/21/2015 +0 days 🔍
04/21/2015 +0 days 🔍
04/21/2015 +0 days 🔍
04/22/2015 +1 days 🔍
04/22/2015 +0 days 🔍
05/28/2015 +36 days 🔍
09/28/2015 +123 days 🔍
05/09/2022 +2415 days 🔍



Advisory: USN-2985-1
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-1781 (🔍)
SecurityFocus: 74255 - GNU glibc CVE-2015-1781 Multiple Buffer Overflow Vulnerabilities
SecurityTracker: 1032178 - Glibc Buffer Overflow in getanswer_r() Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 49835 - GNU GLibC Remote Code Execution due to Passing Improper Input to gethostbyname_r() Function, Medium


Created: 04/22/2015 01:05 PM
Updated: 05/09/2022 03:14 PM
Changes: 04/22/2015 01:05 PM (74), 06/27/2017 03:31 AM (9), 05/09/2022 03:04 PM (4), 05/09/2022 03:08 PM (1), 05/09/2022 03:14 PM (1)
Complete: 🔍
Cache ID: 35:C91:40


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