Bug 1827562 (CVE-2019-12521)
| Summary: | CVE-2019-12521 squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash | ||
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| Product: | [Other] Security Response | Reporter: | Marian Rehak <mrehak> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | anon.amish, code, jonathansteffan, luhliari, uwe.knop |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | squid 4.11, squid 5.0.2 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A flaw was found in squid. 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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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-11-04 02:25:04 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1828373, 1828378 | ||
| Bug Blocks: | 1827553 | ||
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Description
Marian Rehak
2020-04-24 08:16:19 UTC
External References: http://www.squid-cache.org/Advisories/SQUID-2019_12.txt This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-12521 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4743 https://access.redhat.com/errata/RHSA-2020:4743 |