Exim up to 4.97.1/4.98-RC2 Multiline RFC 2231 Header Filename protection mechanism

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Exim up to 4.97.1/4.98-RC2. This vulnerability affects unknown code of the component Multiline RFC 2231 Header Filename Handler. Such manipulation leads to protection mechanism. This vulnerability is referenced as CVE-2024-39929. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Exim up to 4.97.1/4.98-RC2. It has been rated as critical. Affected by this issue is an unknown part of the component Multiline RFC 2231 Header Filename Handler. The manipulation with an unknown input leads to a protection mechanism vulnerability. Using CWE to declare the problem leads to CWE-693. The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Exim through 4.97.1 misparses a multiline RFC 2231 header filename, and thus remote attackers can bypass a $mime_filename extension-blocking protection mechanism, and potentially deliver executable attachments to the mailboxes of end users.

The advisory is available at git.exim.org. This vulnerability is handled as CVE-2024-39929 since 07/04/2024. The exploitation is known to be easy. The attack may be launched remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 4.98-RC3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 1b3209b0577a9327ebb076f3b32b8a159c253f7b is able to eliminate this problem. The bugfix is ready for download at git.exim.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.4
CNA Vector (MITRE): 🔍

CVSSv2info

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

Exploitinginfo

Class: Protection mechanism
CWE: CWE-693
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Exim 4.98-RC3
Patch: 1b3209b0577a9327ebb076f3b32b8a159c253f7b

Timelineinfo

07/04/2024 🔍
07/04/2024 +0 days 🔍
07/04/2024 +0 days 🔍
07/10/2024 +6 days 🔍

Sourcesinfo

Advisory: 6ce5c70cff8989418e05d01fd2a57703007a6357
Status: Confirmed

CVE: CVE-2024-39929 (🔍)
GCVE (CVE): GCVE-0-2024-39929
GCVE (VulDB): GCVE-100-270350

Entryinfo

Created: 07/04/2024 19:02
Updated: 07/10/2024 04:38
Changes: 07/04/2024 19:02 (59), 07/06/2024 08:56 (2), 07/10/2024 04:38 (11)
Complete: 🔍
Cache ID: 216::103

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