unrar up to 5.5.6 libunrar.a EncodeFileName::Decode 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 unrar up to 5.5.6. The impacted element is the function EncodeFileName::Decode of the file libunrar.a. Such manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2017-12940. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in unrar up to 5.5.6. Affected by this issue is the function EncodeFileName::Decode of the file libunrar.a. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read in the EncodeFileName::Decode call within the Archive::ReadHeader15 function.

The bug was discovered 08/15/2017. The weakness was shared 08/18/2017 as not defined mailinglist post (oss-sec). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2017-12940 since 08/18/2017. The exploitation is known to be easy. 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 was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 103463 (GLSA-201709-24 : RAR, UnRAR: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171008 (SUSE Enterprise Linux Security Update for unrar (SUSE-SU-2018:0862-1)).

Upgrading to version 5.5.7 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (103463). The entries VDB-105462, VDB-105465, VDB-105466 and VDB-119570 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • McAfee Web Gateway 7.8.1.0 up to 7.8.1.5

Productinfo

Name

Version

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

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: 103463
Nessus Name: GLSA-201709-24 : RAR, UnRAR: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: unrar 5.5.7

Timelineinfo

08/15/2017 🔍
08/18/2017 +3 days 🔍
08/18/2017 +0 days 🔍
08/18/2017 +0 days 🔍
08/18/2017 +0 days 🔍
09/25/2017 +38 days 🔍
09/26/2017 +1 days 🔍
02/19/2020 +876 days 🔍

Sourcesinfo

Advisory: seclists.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-12940 (🔍)
GCVE (CVE): GCVE-0-2017-12940
GCVE (VulDB): GCVE-100-105464
See also: 🔍

Entryinfo

Created: 08/18/2017 22:54
Updated: 02/19/2020 15:57
Changes: 08/18/2017 22:54 (72), 02/19/2020 15:57 (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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