Proxmox Mail Gateway - Security Advisories

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Subject: PSA-2024-00005-1: SMTP Smuggling​


Publication date: 2024-03-28

Packages: pmg-api, postfix

Details: Postfix was affected by an email spoofing attack that involves a composition of email services with specific differences in the way they handle line endings other than <CR><LF>. See references below for timeline, mitigations and details.

Fixed:
- pmg-api >= 8.0.10 (Proxmox Mail Gateway 8.x)
- pmg-api >= 7.3-11 (Proxmox Mail Gateway 7.x)

References:
- CVE-2023-51764
- https://www.postfix.org/smtp-smuggling.html
- https://forum.proxmox.com/threads/smtp-smuggling-mitigation.138576/
 

Subject: PSA-2024-00007-1: Shim bootloader remote code execution via http response​


Advisory date: 2024-06-28

Packages: shim-unsigned, shim-signed

Details: A remote code execution vulnerability was found in the secure boot Shim bootloader. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.

Fixed: shim-unsigned >= 15.8, shim-signed >= 1.40+pmx1+15.8 (Proxmox VE 8.x, Proxmox Backup Server 3.x, Proxmox Mail Gateway 8.x)

Bullseye-based Proxmox products do not ship a custom version of shim, refer to Debian's security tracker if manual secure boot is in use.

References: CVE-2023-40547, shim 15.8 additionally fixes CVE-2023-40546 and CVE-2023-40548 to CVE-2023-40551
 

Subject: PSA-2024-00009-1: Proxmox VE/Mail Gateway API: post-authentication privileged file read vulnerabilities​


Advisory date: 2024-09-23

Packages:
- Proxmox Virtual Environment: pve-manager, libpve-storage-perl, libpve-http-server-perl, qemu-server
- Proxmox Mail Gateway: pmg-api, libpve-http-server-perl

Details:
Insufficient safeguards against malicious API response values allowed authenticated attackers with 'Sys.Audit' or 'VM.Monitor' privileges to download arbitrary host files via the API.

Two instances of this issue were discovered and reported by the Security Labs team at Snyk.
The issue was introduced in libpve-http-server-perl in version 3.2-1 (Proxmox VE/Proxmox Mail Gateway 6) with commit 6d832db ("allow 'download' to be passed from API handler").

Timeline:
2024-09-04: initial report by Snyk​
2024-09-04: initial analysis and acknowledgment by Proxmox Security Team​
2024-09-06: first iteration of patches submitted for internal review and testing​
2024-09-12: second iteration of patches submitted for internal review and testing​
2024-09-13: patches and tentative roll-out timeline submitted for feedback to Snyk​
2024-09-13: status quo of affected packages was bumped and rolled out to reduce regression potential​
2024-09-19: third iteration of patches with minor usability and backward compatibility improvements submitted for internal review and testing​
2024-09-20: Due to impact, an exception was granted to provide fixes for the EOL Proxmox VE 7 and Proxmox Mail Gateway 7 releases and a backport of the patches got submitted for internal review and testing​
2024-09-23: coordinated release of fixed packages to the Proxmox VE and Proxmox Mail Gateway repositories of the 7 and 8 release series.​

Fixed:
- Proxmox VE 8:
pve-manager >= 8.2.7, libpve-storage-perl >= 8.2.5, libpve-http-server-perl >= 5.1.1,​
(libpve-common-perl >= 8.2.3, only cosmetic changes to reduce misuse potential)​

- Proxmox Mail Gateway 8:
pmg-api >= 8.1.4, libpve-http-server-perl >= 5.1.1, (libpve-common-perl >= 8.2.5)​

- Proxmox Virtual Environment 7:
pve-manager >= 7.4-19, libpve-storage-perl >= 7.4-4, libpve-http-server-perl >= 4.3.0​

- Proxmox Mail Gateway 7:
pmg-api >= 7.3-12, libpve-http-server-perl >= 4.3.0​

References:
- CVE-2024-21545 (reserved)
 

Subject: PSA-2024-00012-1: Proxmox Mail Gateway: unexpected handling of single-part attachments​


Advisory date: 2024-12-12

Packages: pmg-api

Details:
The Remove Attachments and Attachment Quarantine actions in the rule system ignored the Content-Disposition: attachment header for the first MIME part of the mail, which is usually the part containing the mail-text. As e-mails with malicious content do use unexpected header combinations to confuse mail-filters, removing more parts, in case of doubt, is the proper behavior. Additionally, this behavior is more in line with many mail user agents, which treat such mail parts as attachment.

The issue was responsibly reported by Philipp Hutterer <Hutterer@develop-group.de> with a sample mail that contained a single-part attachment, which was not removed.

Fixed:
- pmg-api version 8.1.5
 

Subject: PSA-2024-00015-1: XSS in mail queue fields​


Advisory date: 2024-12-18

Packages: pmg-gui

Details:
Missing encoding in the Proxmox Mail Gateway UI led to HTML code contained in fields of the mail queue view to be rendered by the browser.

This issue was reported by Niels Hendriks from Rootnet.

Fixed: pmg-gui >= 4.1.2
 

Subject: PSA-2025-00005-1: Various SecureBoot bypasses, data integrity violations and sensitive data leaks in Grub​


Advisory date: 2025-03-06

Packages: grub-pc-bin, grub-efi-amd64-bin, grub-efi-amd64-signed, grub-efi-amd64-unsigned

Details:

21 issues in Grub's codebase were found that could allow an attacker to bypass Secure Boot protections (if enabled), leak sensitive data from Grub's environment or configuration or violate other integrity protections within Grub.

Fixed:
- grub-pc-bin (>= 2.06-13+pmx5)
- grub-efi-amd64-bin (>= 2.06-13+pmx5)
- grub-efi-amd64-unsigned (>= 2.06-13+pmx5)
- grub-efi-amd64-signed (>= 1+2.06+13+pmx5)
- proxmox-secure-boot-policies (>= 0.0~git20240117.c443a5f-5)
- proxmox-secure-boot-policies-amd64-signed (>= 0.0~git20240117.c443a5f-5)

To fully prevent downgrade attacks after upgrading to fixed versions of the packages, see the instructions in our wiki:

https://pve.proxmox.com/wiki/Secure_Boot_Setup#Setting_a_Stricter_Revocation_Policy

References:
CVE-2024-45774: reader/jpeg: Heap OOB Write during JPEG parsing.
CVE-2024-45775: commands/extcmd: Missing check for failed allocation.
CVE-2024-45776: grub-core/gettext: Integer overflow leads to Heap OO Write and Read.
CVE-2024-45777: grub-core/gettext: Integer overflow leads to Heap OOB Write.
CVE-2024-45778: fs/bfs: Integer overflow in the BFS parser.
CVE-2024-45779: fs/bfs: Integer overflow leads to Heap OOB Read (Write?) in the BFS parser.
CVE-2024-45780: fs/tar: Integer Overflow causes Heap OOB Write.
CVE-2024-45781: fs/ufs: OOB write in the heap.
CVE-2024-45782: fs/hfs: strcpy() using the volume name (fs/hfs.c:382)
CVE-2024-45783: fs/hfs+: refcount can be decremented twice
CVE-2025-0622: command/gpg: Use-after-free due to hooks not being removed on module unload
CVE-2025-0624: net: Out-of-bounds write in grub_net_search_config_file()
CVE-2025-0677: UFS: Integer overflow may lead to heap based out-of-bounds write when handling symlinks
CVE-2025-0678: squash4: Integer overflow may lead to heap based out-of-bounds write when reading data
CVE-2025-0684: reiserfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
CVE-2025-0685: jfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
CVE-2025-0686: romfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
CVE-2025-0689: udf: Heap based buffer overflow in grub_udf_read_block() may lead to arbitrary code execution
CVE-2025-0690: read: Integer overflow may lead to out-of-bounds write
CVE-2025-1118: commands/dump: The dump command is not in lockdown when secure boot is enabled
CVE-2025-1125: fs/hfs: Integer overflow may lead to heap based out-of-bounds write
 
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