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.
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Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: mitre
Published: 2020-04-15T18:47:43
Updated: 2024-08-04T23:24:38.850Z
Reserved: 2019-06-02T00:00:00
Link: CVE-2019-12521
Vulnrichment
No data.
NVD
Status : Modified
Published: 2020-04-15T19:15:12.393
Modified: 2024-11-21T04:23:01.553
Link: CVE-2019-12521
Redhat