CVE-2019-12519
Critical
Description
An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Squid
PublishedApr 15, 2020
First seenApr 15, 2020
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| squid-cache squid | 3.0 ≤ v ≤ 3.5.28, 4.0 ≤ v ≤ 4.10, 5.0 ≤ v ≤ 5.0.1 | — |
| debian debian_linux | 9.0, 10.0 | — |
| canonical ubuntu_linux | 16.04, 18.04, 19.10, 20.04 | — |
| opensuse leap | 15.1 | — |
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