CVE-2018-15133
Laravel — Laravel Deserialization of Untrusted Data Vulnerability
Laravel · CWE-502 — Deserialization of untrusted data · in CISA KEV since 2024-01-16
EVRS 79 of 100 Urgent
Patch This Cycle
Rank 619 of 2,960 tracked
Why it scores 79
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and an EPSS probability of 0.766.
- CISA KEVApplied
- RansomwareDid not apply
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
Fixed in
- laravel/framework
5.6.30
Affected versions
- laravel/framework (composer)
affected <= 5.5.40, no fixed version listedaffected >= 5.6.0, <= 5.6.29, fixed in 5.6.30
Remediation
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD and GitHub. Affected packages also in GitHub Advisory GHSA-qvqm-h22r-4cp9 (CC BY 4.0).
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 8.1 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.766 (99.54th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Unknown or none | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2024-02-06 · KEV since 2024 · listed over a year | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | Public module exists | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 8.1 (v3.1), assigned by mitre. | Listed | ENISA EUVD |
Description
NVDIn Laravel Framework through 5.5.40 and 5.6.x through 5.6.29, remote code execution might occur as a result of an unserialize call on a potentially untrusted X-XSRF-TOKEN value. This involves the decrypt method in Illuminate/Encryption/Encrypter.php and PendingBroadcast in gadgetchains/Laravel/RCE/3/chain.php in phpggc. The attacker must know the application key, which normally would never occur, but could happen if the attacker previously had privileged access or successfully accomplished a previous attack.
What CISA says to do
Public module
Metasploit lists a public excellent-rank module for this CVE: PHP Laravel Framework token Unserialize Remote Command Execution (unix/http/laravel_token_unserialize_exec). A module existing is not the same as active exploitation; see metasploit.com.