Path traversal in lighttpd - CVE-2018-19052
Published: November 8, 2018
Vulnerability identifier: #VU15757
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-19052
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences. A remote attacker can send a specially crafted HTTP request and read arbitrary file located in a directory above an alias target, with a specific mod_alias configuration where the matched alias lacks a trailing '/' character, but the alias target filesystem path does have a trailing '/' character
Affected software
lighttpd
Amazon Linux AMI
Ubuntu
Opensuse
SUSE Linux
lighttpd (Ubuntu package)
Amazon Linux AMI
Ubuntu
Opensuse
SUSE Linux
lighttpd (Ubuntu package)
How to mitigate CVE-2018-19052
Install updates from vendor's website.
lighttpd - update to 1.4.50
lighttpd (Ubuntu package) - addressed in versions 1.4.33-1+nmu2ubuntu2.1+esm1, 1.4.35-4ubuntu2.1+esm1, 1.4.45-1ubuntu3.18.04.1+esm1
lighttpd (Ubuntu package) - addressed in versions 1.4.33-1+nmu2ubuntu2.1+esm1, 1.4.35-4ubuntu2.1+esm1, 1.4.45-1ubuntu3.18.04.1+esm1