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CVE-2019-18676

Date: November 26, 2019

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.

Language: C

Severity Score

Related Resources (17)

http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
https://usn.ubuntu.com/4446-1/
https://access.redhat.com/security/cve/CVE-2019-18676
https://nvd.nist.gov/vuln/detail/CVE-2019-18676
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-18676
https://www.debian.org/security/2020/dsa-4682
https://security-tracker.debian.org/tracker/CVE-2019-18676
https://bugzilla.suse.com/show_bug.cgi?id=1156329
https://usn.ubuntu.com/4213-1/
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
https://github.com/squid-cache/squid/pull/275
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
https://www.mend.io/vulnerability-database/CVE-2019-18676

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

Out-of-bounds Write

CWE-787

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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