Medium severity · published Nov 26, 2019
CVE-2019-18677
An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length…
6.1
CVSS
7.2%
EPSS
No
On KEV
Description
An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)7.2% · higher than 94% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
30; 31 · source: NVD
SQ
Squid · Squid-cache
2.0 through 2.7; 3.0 through 3.5.28; 4.0 through 4.8; 2.7; 2.7; 2.7; +5 more · source: NVD
UL
Ubuntu Linux · Canonical
16.04; 18.04; 19.04; 19.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18677
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-18677
Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2019_9.txt
Release Notes
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-e5f1813a674848dde570f7920873e1071f96e0b4.patch
Release Notes
http://www.squid-cache.org/Versions/v4/changesets/squid-4-36492033ea4097821a4f7ff3ddcb971fbd1e8ba0.patch
Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1156328
Patch
https://github.com/squid-cache/squid/pull/427
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html
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