libevent up to 2.1.5 evdns.c name_parse label_len out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in libevent up to 2.1.5. This affects the function name_parse of the file evdns.c. Executing a manipulation of the argument label_len can lead to out-of-bounds. This vulnerability appears as CVE-2016-10195. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in libevent up to 2.1.5. This vulnerability affects the function name_parse of the file evdns.c. The manipulation of the argument label_len with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The name_parse function in evdns.c in libevent before 2.1.6-beta allows remote attackers to have unspecified impact via vectors involving the label_len variable, which triggers an out-of-bounds stack read.

The bug was discovered 01/31/2017. The weakness was presented 03/15/2017 by Guido Vranken (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2016-10195 since 02/01/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 15 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 97195 (Debian DLA-824-1 : libevent 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 and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170815 (OpenSUSE Security Update for libevent (openSUSE-SU-2018:0220-1)).

Upgrading to version 2.1.6-beta eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (97195) and SecurityFocus (BID 96014†). See VDB-98129 and VDB-98130 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 97195
Nessus Name: Debian DLA-824-1 : libevent security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703789
OpenVAS Name: Debian Security Advisory DSA 3789-1 (libevent - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libevent 2.1.6-beta

Timelineinfo

01/31/2017 🔍
01/31/2017 +0 days 🔍
02/01/2017 +1 days 🔍
02/15/2017 +14 days 🔍
02/16/2017 +1 days 🔍
03/15/2017 +27 days 🔍
03/15/2017 +0 days 🔍
03/16/2017 +1 days 🔍
09/08/2020 +1272 days 🔍

Sourcesinfo

Product: github.com

Advisory: openwall.com
Researcher: Guido Vranken
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-10195 (🔍)
GCVE (CVE): GCVE-0-2016-10195
GCVE (VulDB): GCVE-100-98128

OVAL: 🔍

SecurityFocus: 96014 - libevent Multiple Security Vulnerabilities
OSVDB: - CVE-2016-10195 - libevent - Out-of-Bounds Read Issue

See also: 🔍

Entryinfo

Created: 03/16/2017 13:28
Updated: 09/08/2020 12:53
Changes: 03/16/2017 13:28 (81), 09/08/2020 12:53 (3)
Complete: 🔍
Cache ID: 216::103

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

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