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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-2278-1 squid3 security update
Debian DSA Debian DSA DSA-4682-1 squid security update
EUVD EUVD EUVD-2019-4116 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.
Ubuntu USN Ubuntu USN USN-4356-1 Squid vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-04T23:24:38.850Z

Reserved: 2019-06-02T00:00:00

Link: CVE-2019-12521

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-04-15T19:15:12.393

Modified: 2024-11-21T04:23:01.553

Link: CVE-2019-12521

cve-icon Redhat

Severity : Moderate

Publid Date: 2020-04-24T00:00:00Z

Links: CVE-2019-12521 - Bugzilla

cve-icon OpenCVE Enrichment

No data.