# CVE-2019-18679: libecap: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. The... CVE-2019-18679 is fixed in 8 products on 1 platform, first by squid 3.5.27-1ubuntu1.4, released November 26, 2019. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2019-18679 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.4098 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Nov 26, 2019 ## Description Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. The following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467) Security Fix(es): * squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520) * squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521) * squid: Improper input validation in URI processor (CVE-2019-12523) * squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524) * squid: Heap overflow issue in URN processing (CVE-2019-12526) * squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528) * squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529) * squid: Denial of service in cachemgr.cgi (CVE-2019-12854) * squid: Buffer overflow in URI processor (CVE-2019-18676) * squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677) * squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678) * squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679) * squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860) * squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449) * squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450) * squid: DoS in TLS handshake (CVE-2020-14058) * squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049) * squid: Improper input validation could result in a DoS (CVE-2020-24606) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes linked from the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libecap RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | [RHSA-2020:4743](https://patchblox.com/security/data/fix/linux/rhsa-2020-4743.md) | Nov 4, 2020 | | Linux | libecap ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2020-4743](https://patchblox.com/security/data/fix/linux/elsa-2020-4743.md) | Nov 10, 2020 | | Linux | libecap-devel RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | [RHSA-2020:4743](https://patchblox.com/security/data/fix/linux/rhsa-2020-4743.md) | Nov 4, 2020 | | Linux | libecap-devel ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2020-4743](https://patchblox.com/security/data/fix/linux/elsa-2020-4743.md) | Nov 10, 2020 | | Linux | squid RHEL 8 | 7:4.11-3.module+el8.3.0+7851+7808b5f9 | [RHSA-2020:4743](https://patchblox.com/security/data/fix/linux/rhsa-2020-4743.md) | Nov 4, 2020 | | Linux | squid Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.4 | [squid 3.5.27-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-3.5.27-1ubuntu1.4.md) | Nov 26, 2019 | | Linux | squid Ubuntu 20.04 LTS (focal) | 4.9-2ubuntu1 | [squid 4.9-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-4.9-2ubuntu1.md) | Nov 26, 2019 | | Linux | squid ol 8 | 7:4.11-3.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2020-4743](https://patchblox.com/security/data/fix/linux/elsa-2020-4743.md) | Nov 10, 2020 | | Linux | squid-cgi Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.4 | [squid-cgi 3.5.27-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-cgi-3.5.27-1ubuntu1.4.md) | Nov 26, 2019 | | Linux | squid-cgi Ubuntu 20.04 LTS (focal) | 4.9-2ubuntu1 | [squid-cgi 4.9-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-cgi-4.9-2ubuntu1.md) | Nov 26, 2019 | | Linux | squid-common Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.4 | [squid-common 3.5.27-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-common-3.5.27-1ubuntu1.4.md) | Nov 26, 2019 | | Linux | squid-common Ubuntu 20.04 LTS (focal) | 4.9-2ubuntu1 | [squid-common 4.9-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-common-4.9-2ubuntu1.md) | Nov 26, 2019 | | Linux | squid-purge Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.4 | [squid-purge 3.5.27-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-purge-3.5.27-1ubuntu1.4.md) | Nov 26, 2019 | | Linux | squid-purge Ubuntu 20.04 LTS (focal) | 4.9-2ubuntu1 | [squid-purge 4.9-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-purge-4.9-2ubuntu1.md) | Nov 26, 2019 | | Linux | squid3 Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.4 | [squid3 3.5.27-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid3-3.5.27-1ubuntu1.4.md) | Nov 26, 2019 | | Linux | squid3 Ubuntu 20.04 LTS (focal) | 4.9-2ubuntu1 | [squid3 4.9-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid3-4.9-2ubuntu1.md) | Nov 26, 2019 | | Linux | squidclient Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.4 | [squidclient 3.5.27-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squidclient-3.5.27-1ubuntu1.4.md) | Nov 26, 2019 | | Linux | squidclient Ubuntu 20.04 LTS (focal) | 4.9-2ubuntu1 | [squidclient 4.9-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squidclient-4.9-2ubuntu1.md) | Nov 26, 2019 | --- Data as of 2026-11-07T18:46:35Z UTC. 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