Out-of-Bounds Read Vulnerability in Exim Email Server
CVE-2020-28025

7.5HIGH

Key Information:

Vendor

Exim

Status
Exim
Vendor
CVE Published:
6 May 2021

What is CVE-2020-28025?

The Exim email server prior to version 4.94.2 contains an Out-of-Bounds Read vulnerability. This issue arises from inadequate validation in the pdkim_finish_bodyhash function, where the relationship between sig->bodyhash.len and b->bh.len is not properly checked. An attacker can exploit this vulnerability by crafting a malicious DKIM-Signature header, potentially leaking sensitive information from the process memory of the affected server. This flaw raises significant concerns for data integrity and confidentiality within email communications.

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.