| Release Date: | 2020-04-15 |
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.
See more information about CVE-2019-12521 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
| Base Score: | 5.9 | Base Metrics: | AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Access Vector: | Network | Attack Complexity: | High |
| Privileges Required: | None | User Interaction: | None |
| Scope: | Unchanged | Confidentiality Impact: | None |
| Integrity Impact: | None | Availability Impact: | High |
| Platform | Errata | Release Date |
| Oracle Linux version 8 (libecap) | ELSA-2020-4743 | 2020-11-10 |
| Oracle Linux version 8 (squid) | ELSA-2020-4743 | 2020-11-10 |
This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team