Security readout for executives and security teams
Plain-English summary
This flaw affects Proxmox VE and Proxmox Mail Gateway proxy handling. A crafted request could make the server access unintended internal resources and disclose local files. In PMG, prior backup use could expose an auth key inside readable backup archives, potentially enabling root@pam escalation.
Executive priority
Prioritize remediation for internet-reachable or broadly accessible Proxmox management systems. The business risk is unauthorized file disclosure and, for PMG with backups, possible administrative takeover.
Technical view
CVE-2022-35508 is an SSRF issue between pve/pmgproxy and pve/pmgdaemon, tracked as CWE-918. Sources describe file disclosure on the server and a PMG-specific escalation path when backup archives containing authkey values are present with 0644 permissions. The listed fixed package is pve-http-server 4.1-3.
Likely exposure
Exposure is most relevant to Proxmox VE or PMG systems running vulnerable pve-http-server builds, especially where management interfaces or unprivileged accounts are reachable. Exact affected version ranges are not provided in the bundle.
Exploitation context
The bundle includes public research and vendor commit references, but no KEV listing and no cited evidence of active exploitation. The description says an unprivileged account can exploit it, while the CVSS vector says no privileges required; treat that mismatch as unresolved.
Researcher notes
Sources do not provide complete affected version ranges. The privilege requirement is inconsistent between the narrative and CVSS vector. Analysis should distinguish generic SSRF/file disclosure from the PMG backup-dependent root@pam escalation condition.
Mitigation direction
- Upgrade to pve-http-server 4.1-3 or a vendor-supported fixed release.
- Restrict Proxmox VE and PMG management access to trusted administrative networks.
- Audit and secure PMG backup archives if the backup feature was ever used.
- Rotate exposed PMG authentication material if backup archive disclosure is suspected.
- Review Proxmox vendor guidance for any product-specific remediation steps.
Validation and detection
- Inventory Proxmox VE and PMG systems and identify pve-http-server versions.
- Confirm pve-http-server is 4.1-3 or later on affected systems.
- Check whether PMG backups exist and whether archive permissions are overly broad.
- Review access logs for unusual proxy-to-daemon request patterns or file-access anomalies.
- Validate management interfaces are not broadly exposed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2022-35508 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://git.proxmox.com/?p=pve-http-server.git%3Ba=commitdiff%3Bh=580d540ea907ba15f64379c5bb69ecf1a49a875fCVE reference
- https://git.proxmox.com/?p=pve-http-server.git%3Ba=commitdiff%3Bh=e9df8a6e76b2a18f89295a5d92a62177bbf0f762CVE reference
- https://git.proxmox.com/?p=pve-http-server.git%3Ba=commitdiff%3Bh=c2bd69c7b5e9c775f96021cf8ae53da3dbd9029dCVE reference
- https://starlabs.sg/blog/2022/12-multiple-vulnerabilites-in-proxmox-ve--proxmox-mail-gateway/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.