Security readout for executives and security teams
Plain-English summary
CVE-2022-31157 affects PHP applications using packbackbooks/lti-1-3-php-library before 5.0. The library generated nonces with insufficient cryptographic strength, creating a high integrity risk for LTI 1.3 tool-provider integrations. The cited advisory says version 5.0 patches the issue and no workaround is known.
Executive priority
Prioritize remediation for any internet-facing LTI provider using the vulnerable library. The issue has a clear vendor fix and high integrity impact, but no cited active exploitation or workaround. Upgrade should be scheduled promptly through normal emergency change controls if exposed.
Technical view
The vulnerability is CWE-327, use of a broken or risky cryptographic algorithm. Affected versions before 5.0 use insufficiently complex random nonce generation. CVSS 3.1 is 7.5 with network exposure, low attack complexity, no privileges, no user interaction, and high integrity impact.
Likely exposure
Exposure is limited to systems that include packbackbooks/lti-1-3-php-library before version 5.0, especially PHP services acting as LTI 1.3 tool providers. The source bundle does not identify affected deployments, downstream products, or specific runtime configurations.
Exploitation context
The source bundle does not show active exploitation, and the CVE is not listed as KEV. The advisory describes the weakness and patch but does not provide exploitation details. Treat this as a credible integrity risk where the vulnerable library supports trust-sensitive LTI flows.
Researcher notes
Evidence is narrow but consistent: affected package, version boundary, weakness class, CVSS, and fix are stated. The sources do not document exploit maturity, affected configurations beyond versions before 5.0, or workaround details. Avoid inferring broader LTI platform impact without local dependency evidence.
Mitigation direction
- Upgrade packbackbooks/lti-1-3-php-library to version 5.0 or later.
- Check the GitHub advisory for any newer vendor guidance.
- Redeploy affected PHP services after dependency upgrade.
- Prioritize externally reachable LTI 1.3 tool-provider services.
- Increase monitoring for unusual LTI authentication or launch integrity failures.
Validation and detection
- Inventory PHP projects using packbackbooks/lti-1-3-php-library.
- Review dependency manifests and lockfiles for versions below 5.0.
- Confirm deployed artifacts include version 5.0 or later.
- Map affected services to public routes and LTI integrations.
- Record compensating monitoring if immediate upgrade is delayed.
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-327: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2022-31157 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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:N/I:H/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/packbackbooks/lti-1-3-php-library/security/advisories/GHSA-768m-5w34-2xf5CVE reference · x_refsource_CONFIRM
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.
Use of a Broken or Risky Cryptographic Algorithm
Use of a Broken or Risky Cryptographic Algorithm represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.