vulnerability
Red Hat: CVE-2019-12521: CVE-2019-12521 squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:N/I:N/A:P) | 2020-04-15 | 2020-11-05 | 2024-11-27 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:P)
Published
2020-04-15
Added
2020-11-05
Modified
2024-11-27
Description
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.
Solution(s)
redhat-upgrade-libecapredhat-upgrade-libecap-debuginforedhat-upgrade-libecap-debugsourceredhat-upgrade-libecap-develredhat-upgrade-squidredhat-upgrade-squid-debuginforedhat-upgrade-squid-debugsource
References
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