Critical severity · published Nov 26, 2019
CVE-2019-12523
An issue was discovered in Squid before 4.9
9.1
CVSS
4.3%
EPSS
No
On KEV
Description
An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only listen on localhost.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)4.3% · higher than 91% 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
LE
Leap · Opensuse
15.0 · 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-2019-12523
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-12523
Broken Link
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html
Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1156329
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/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
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