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CVE-2019-12521

Status Candidate

Overview

An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.

Related Files

Red Hat Security Advisory 2020-4743-01
Posted Nov 4, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-4743-01 - Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. Issues addressed include buffer overflow, bypass, cross site request forgery, denial of service, heap overflow, information leakage, and out of bounds read vulnerabilities.

tags | advisory, web, denial of service, overflow, vulnerability, csrf
systems | linux, redhat
advisories | CVE-2019-12520, CVE-2019-12521, CVE-2019-12523, CVE-2019-12524, CVE-2019-12526, CVE-2019-12528, CVE-2019-12529, CVE-2019-12854, CVE-2019-18676, CVE-2019-18677, CVE-2019-18678, CVE-2019-18679, CVE-2019-18860, CVE-2020-14058, CVE-2020-15049, CVE-2020-24606, CVE-2020-8449, CVE-2020-8450
SHA-256 | 6a36bcffb87c3fe39872c03d6a9977d9fae1e90b42488ae64fd7e983caa0c436
Debian Security Advisory 4682-1
Posted May 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4682-1 - Multiple security issues were discovered in the Squid proxy caching server, which could result in the bypass of security filters, information disclosure, the execution of arbitrary code or denial of service.

tags | advisory, denial of service, arbitrary, info disclosure
systems | linux, debian
advisories | CVE-2019-12519, CVE-2019-12520, CVE-2019-12521, CVE-2019-12523, CVE-2019-12524, CVE-2019-12526, CVE-2019-12528, CVE-2019-18676, CVE-2019-18677, CVE-2019-18678, CVE-2019-18679, CVE-2020-11945, CVE-2020-8449, CVE-2020-8450
SHA-256 | 87ca95b4ae1d88238583d52bb863f0a6581ef8c84693704ff5fc9f5b91f4325a
Gentoo Linux Security Advisory 202005-05
Posted May 13, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202005-5 - Multiple vulnerabilities have been found in Squid, the worst of which could result in the arbitrary execution of code. Versions less than 4.11 are affected.

tags | advisory, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2019-12519, CVE-2019-12521, CVE-2020-11945
SHA-256 | f86a32f4b05bd5ead7ea9b9b8aecfcac7e286aa57a83dda6bfa09afe82284eea
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