New Vital Safety Flaws Expose Exim Mail Servers to Distant Assaults

Sep 30, 2023THNE mail Safety / Hacking Information

A number of safety vulnerabilities have been disclosed within the Exim mail transfer agent that, if efficiently exploited, might end in info disclosure and distant code execution.

The record of flaws, which have been reported anonymously means again in June 2022, is as follows –

  • CVE-2023-42114 (CVSS rating: 3.7) – Exim NTLM Problem Out-Of-Bounds Learn Info Disclosure Vulnerability
  • CVE-2023-42115 (CVSS rating: 9.8) – Exim AUTH Out-Of-Bounds Write Distant Code Execution Vulnerability
  • CVE-2023-42116 (CVSS rating: 8.1) – Exim SMTP Problem Stack-based Buffer Overflow Distant Code Execution Vulnerability
  • CVE-2023-42117 (CVSS rating: 8.1) – Exim Improper Neutralization of Particular Components Distant Code Execution Vulnerability
  • CVE-2023-42118 (CVSS rating: 7.5) – Exim libspf2 Integer Underflow Distant Code Execution Vulnerability
  • CVE-2023-42119 (CVSS rating: 3.1) – Exim dnsdb Out-Of-Bounds Learn Info Disclosure Vulnerability

Probably the most extreme of the vulnerabilities is CVE-2023-42115, which permits distant, unauthenticated attackers to execute arbitrary code on affected installations of Exim.


“The specific flaw exists within the SMTP service, which listens on TCP port 25 by default,” the Zero Day Initiative stated in an alert revealed this week.

“The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of a buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.”

Exim maintainers, in a message shared on the Open Supply Safety mailing record oss-security, stated fixes for CVE-2023-42114, CVE-2023-42115, and CVE-2023-42116 are “available in a protected repository and are ready to be applied by the distribution maintainers.”

“The remaining issues are debatable or miss information we need to fix them,” including it requested ZDI extra specifics in regards to the points and that it “didn’t get answers we were able to work with” till Might 2023. The Exim group additional stated they’re awaiting detailed specifics on the opposite three shortcomings.

Nonetheless, the ZDI pushed again in opposition to claims about “sloppy handling” and “neither team pinging the other for 10 months,” stating it reached out a number of instances to the builders.

“After our disclosure timeline was exceeded by many months, we notified the maintainer of our intent to publicly disclose these bugs, at which time we were told, ‘you do what you do,'” it said.

“If these bugs have been appropriately addressed, we will update our advisories with a link to the security advisory, code check-in, or other public documentation closing the issue.”

Within the absence of patches, the ZDI recommends proscribing interplay with the applying as the one “salient” mitigation technique.

This isn’t the primary time safety flaws have been uncovered within the broadly used mail switch agent. In Might 2021, Qualys disclosed a set of 21 vulnerabilities collectively tracked as 21Nails that allow unauthenticated attackers to attain full distant code execution and achieve root privileges.


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Beforehand in Might 2020, the U.S. authorities reported that hackers affiliated with Sandworm, a state-sponsored group from Russia, had been exploiting a important Exim vulnerability (CVE-2019-10149CVSS rating: 9.8) to penetrate delicate networks.

The event additionally comes sizzling on the heels of a brand new research by researchers from the College of California San Diego that found a novel method referred to as forwarding-based spoofing which takes benefit of weaknesses in e-mail forwarding to ship messages impersonating reliable entities, thereby compromising on integrity.

“The original protocol used to check the authenticity of an email implicitly assumes that each organization operates its own mailing infrastructure, with specific IP addresses not used by other domains,” the analysis found.

“But today, many organizations outsource their email infrastructure to Gmail and Outlook. As a result, thousands of domains have delegated the right to send email on their behalf to the same third party. While these third-party providers validate that their users only send email on behalf of domains that they operate, this protection can be bypassed by email forwarding.”

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Author: (The Hacker Information)
Date: 2023-09-30 00:14:00

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Alina A, Toronto
Alina A, Toronto
Alina A, an UofT graduate & Google Certified Cyber Security analyst, currently based in Toronto, Canada. She is passionate for Research and to write about Cyber-security related issues, trends and concerns in an emerging digital world.


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