🛡️ CVE-2019-18887 — http-kernel

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-203 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Symfony Http-Kernel has non-constant time comparison in UriSigner

When checking the signature of an URI (an ESI fragment URL for instance), the URISigner did not used a constant time string comparison function, resulting in a potential remote timing attack vulnerability.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2019-18887 is recorded against 2 packages.

  • symfony/http-kernel (from 4.3.0 up to 4.3.8)
  • symfony/symfony (from 4.3.0 up to 4.3.8)

Timeline and source

Published on 26 March 2022 and last revised on 20 February 2024. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
symfony.com (Web)
symfony.com (Web)
symfony.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-203
Public Exploit ✅ No
Source OSV
Published 2022-03-26
Updated 2026-08-12
Modified 2024-02-20
Fix URL N/A

Affected Packages

Software From version Fixed in
symfony/http-kernel 4.3.0 4.3.8
symfony/symfony 4.3.0 4.3.8

References

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