OpenPGP CFB EFAIL cryptographic issue ⚔ [Disputed]

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in OpenPGP. Impacted is an unknown function of the component CFB. Executing a manipulation can lead to cryptographic issue (EFAIL). This vulnerability is handled as CVE-2017-17688. The attack can be executed remotely. There is not any exploit available. The existence of this vulnerability is still disputed at present. You should upgrade the affected component. Once again VulDB remains the best source for vulnerability data.

Detailsinfo

A vulnerability was found in OpenPGP (affected version not known). It has been declared as problematic. This vulnerability affects some unknown functionality of the component CFB. The manipulation with an unknown input leads to a cryptographic issue vulnerability (EFAIL). The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality. CVE summarizes:

** DISPUTED ** The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification.

The bug was discovered 05/14/2018. The weakness was released 05/16/2018 by Damian Poddebniak (Basti) (Website). The advisory is available at flaked.sockpuppet.org. Third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification. This vulnerability was named CVE-2017-17688 since 12/15/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600 by the MITRE ATT&CK project.

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 171234 (OpenSUSE Security Update for enigmail (openSUSE-SU-2018:1347-1)).

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 104162†). Entry connected to this vulnerability is available at VDB-117827. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

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

NVD Base Score: 5.9
NVD Vector: 🔍

CNA Base Score: 5.9
CNA Vector: 🔍

CVSSv2info

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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 🔍
08/06/2024 +2269 days 🔍

Sourcesinfo

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

CVE: CVE-2017-17688 (🔍)
GCVE (CVE): GCVE-0-2017-17688
GCVE (VulDB): GCVE-100-117826
SecurityFocus: 104162 - OpenPGP CVE-2017-17688 Man In The Middle Information Disclosure Vulnerability
SecurityTracker: 1040904

See also: 🔍

Entryinfo

Created: 05/17/2018 08:23 AM
Updated: 08/06/2024 03:08 AM
Changes: 05/17/2018 08:23 AM (77), 02/06/2020 09:00 AM (8), 03/13/2023 04:10 PM (5), 08/06/2024 03:08 AM (26)
Complete: 🔍
Cache ID: 244:7D5:40

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