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Last updated: 2/20/2016 3:52:29 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2015-7547

Original release date: 02/18/2016
Last revised: 02/19/2016
Source: US-CERT/NIST

Overview

Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc or libc6) before 2.23 allow remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted DNS response that triggers a call to the getaddrinfo function with the AF_UNSPEC or AF_INET6 address family, related to performing "dual A/AAAA DNS queries" and the libnss_dns.so.2 NSS module.

Impact

CVSS Severity (version 3.0):
CVSS v3 Base Score: 8.1 High
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.2
CVSS Version 3 Metrics:
Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High
CVSS Severity (version 2.0):
CVSS v2 Base Score: 6.8 MEDIUM
Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P) (legend)
Impact Subscore: 6.4
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: CONFIRM
Name: https://support.f5.com/kb/en-us/solutions/public/k/47/sol47098834.html
Hyperlink: https://support.f5.com/kb/en-us/solutions/public/k/47/sol47098834.html
External Source: MISC
Name: https://googleonlinesecurity.blogspot.com/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html
Type: Advisory
Hyperlink: https://googleonlinesecurity.blogspot.com/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=1293532
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=1293532
External Source: UBUNTU
Name: USN-2900-1
Hyperlink: http://ubuntu.com/usn/usn-2900-1
External Source: CONFIRM
Name: https://sourceware.org/bugzilla/show_bug.cgi?id=18665
Hyperlink: https://sourceware.org/bugzilla/show_bug.cgi?id=18665
External Source: MLIST
Name: [libc-alpha] 20160216 [PATCH] CVE-2015-7547 --- glibc getaddrinfo() stack-based buffer overflow
Type: Advisory; Patch Information
Hyperlink: https://sourceware.org/ml/libc-alpha/2016-02/msg00416.html
External Source: CONFIRM
Name: https://access.redhat.com/articles/2161461
Type: Advisory
Hyperlink: https://access.redhat.com/articles/2161461

Technical Details

Vulnerability Type (View All)
CVE Standard Vulnerability Entry http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7547

Change History 1 change record found - show changes