High severity · published Nov 26, 2019
CVE-2019-18676
An issue was discovered in Squid 3.x and 4.x through 4.8
7.5
CVSS
9.2%
EPSS
No
On KEV
Description
An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)9.2% · higher than 95% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
FE
Fedora · Fedoraproject
30; 31 · source: NVD
SQ
Squid · Squid-cache
3.0 through 3.5.28; 4.0 through 4.8 · source: NVD
UL
Ubuntu Linux · Canonical
16.04; 18.04; 19.04; 19.10; 16.04; 18.04 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18676
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-18676
Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
Patch
http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch
Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1156329
Patch
https://github.com/squid-cache/squid/pull/275
Mailing List
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
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