SMIME CFB EFAIL cryptographic issue ⚔ [Disputed]

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability has been found in SMIME and classified as problematic. The affected element is an unknown function of the component CFB. The manipulation leads to cryptographic issue (EFAIL). This vulnerability is uniquely identified as CVE-2017-17689. The attack is possible to be carried out remotely. No exploit exists. The presence of this vulnerability remains uncertain at this time. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in SMIME (the affected version unknown). It has been rated as problematic. This issue affects an unknown part of the component CFB. The manipulation with an unknown input leads to a cryptographic issue vulnerability (EFAIL). Using CWE to declare the problem leads to CWE-310. Impacted is confidentiality. The summary by CVE is:

The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.

The bug was discovered 05/14/2018. The weakness was disclosed 05/16/2018 by Damian Poddebniak (Basti) (Website). It is possible to read the advisory at securityfocus.com. The identification of this vulnerability is CVE-2017-17689 since 12/15/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The real existence of this vulnerability is still doubted at the moment. The vulnerability scanner Nessus provides a plugin with the ID 109933 (openSUSE Security Update : enigmail (openSUSE-2018-474) (EFAIL)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171160 (OpenSUSE Security Update for enigmail (openSUSE-SU-2018:1330-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109933) and SecurityFocus (BID 104165†). The entry VDB-117826 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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

Name: EFAIL
Class: Cryptographic issue / EFAIL
CWE: CWE-310
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: 109933
Nessus Name: openSUSE Security Update : enigmail (openSUSE-2018-474) (EFAIL)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 54340
OpenVAS Name: Fedora Update for thunderbird-enigmail FEDORA-2018-6020628437
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: 🔍

Timelineinfo

12/15/2017 🔍
05/14/2018 +150 days 🔍
05/14/2018 +0 days 🔍
05/16/2018 +1 days 🔍
05/16/2018 +0 days 🔍
05/17/2018 +1 days 🔍
05/19/2018 +2 days 🔍
05/21/2018 +2 days 🔍
03/13/2023 +1757 days 🔍

Sourcesinfo

Advisory: SA_18_22⛔
Researcher: Damian Poddebniak (Basti)
Status: Not defined
Confirmation: 🔍
Disputed: 🔍

CVE: CVE-2017-17689 (🔍)
GCVE (CVE): GCVE-0-2017-17689
GCVE (VulDB): GCVE-100-117827
SecurityFocus: 104165 - Multiple Products S/MIME CVE-2017-17689 Man In The Middle Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 05/17/2018 08:24
Updated: 03/13/2023 16:17
Changes: 05/17/2018 08:24 (76), 02/06/2020 09:07 (8), 03/13/2023 16:17 (4)
Complete: 🔍
Cache ID: 216:5F0:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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