Description
Impact: The morgan logging middleware's :remote-user token extracts the Basic auth username from the Authorization request header and writes it to the log stream without neutralizing control characters. An unauthenticated attacker can send a crafted Authorization Basic header containing CR or LF bytes to inject forged log lines, breaking the one-request-per-line structure of access logs and enabling log forgery against downstream log consumers. The built-in combined, common, default, and short formats are affected, as well as any custom format that references :remote-user. Affected versions: morgan 1.2.0 through 1.10.1. Patches: upgrade to morgan 1.11.0, which neutralizes control characters in the :remote-user token output. Workarounds: use a custom format string that does not include :remote-user.
Problem types
CWE-117: Improper Output Neutralization for Logs
Product status
1.2.0 (semver)
1.11.0 (semver)
Credits
Yuki Matsuhashi
Ulises Gascón
Jon Church
References
github.com/...morgan/security/advisories/GHSA-4vj7-5mj6-jm8m
cna.openjsf.org/security-advisories.html