NULL pointer derefenrece in Squid - CVE-2018-1000027
Published: January 23, 2018 / Updated: June 30, 2020
Vulnerability identifier: #VU10164
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-1000027
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect pointer handling when processing ESI responses or downloading intermediate CA certificates. A remote attacker can supply a specially crafted response to the vulnerable server and trigger application crash.
The vulnerability exists due to incorrect pointer handling when processing ESI responses or downloading intermediate CA certificates. A remote attacker can supply a specially crafted response to the vulnerable server and trigger application crash.
Affected software
Squid
Ubuntu
Fedora
squid (Ubuntu package)
squid
Ubuntu
Fedora
squid (Ubuntu package)
squid
How to mitigate CVE-2018-1000027
Update to version 4.0.23.
squid (Ubuntu package) - update to Ubuntu Pro (Infra-only)
squid - addressed in versions 4.0.23-1.fc26, 4.0.23-2.fc27
squid - addressed in versions 4.0.23-1.fc26, 4.0.23-2.fc27