Exim 4.92.0/4.92.1/4.92.2 EHLO Command string.c string_vformat buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Exim 4.92.0/4.92.1/4.92.2 and classified as critical. Affected by this vulnerability is the function string_vformat of the file string.c of the component EHLO Command Handler. The manipulation results in buffer overflow. This vulnerability is reported as CVE-2019-16928. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in Exim 4.92.0/4.92.1/4.92.2 (Mail Server Software). It has been classified as critical. Affected is the function string_vformat of the file string.c of the component EHLO Command Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.

The weakness was disclosed 09/27/2019 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is traded as CVE-2019-16928 since 09/27/2019. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a exploit are known.

It is declared as attacked. This issue was added on 03/03/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 03/17/2022:

Apply updates per vendor instructions.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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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: 9.0
VulDB Meta Temp Score: 8.9

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

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: git.exim.org

Timelineinfo

09/27/2019 🔍
09/27/2019 +0 days 🔍
09/28/2019 +1 days 🔍
02/05/2025 +1957 days 🔍

Sourcesinfo

Advisory: 478effbfd9c3cc5a627fc671d4bf94d13670d65f
Status: Confirmed

CVE: CVE-2019-16928 (🔍)
GCVE (CVE): GCVE-0-2019-16928
GCVE (VulDB): GCVE-100-142692
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/28/2019 17:47
Updated: 02/05/2025 04:34
Changes: 09/28/2019 17:47 (38), 09/14/2020 09:35 (18), 12/28/2023 16:29 (4), 12/28/2023 16:36 (1), 04/23/2024 19:57 (25), 07/24/2024 17:10 (3), 09/09/2024 22:29 (1), 02/05/2025 04:34 (15)
Complete: 🔍
Cache ID: 216::103

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