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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 hol...
CVE-2019-12521
First seen on SecPulse
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2019-12521 squid Fixed in: 4.11-1
Original description The description as published by the source.
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.
References
- advisory lists.opensuse.org
- advisory gitlab.com
- advisory lists.debian.org
- advisory security.gentoo.org
- advisory security.netapp.com
- advisory usn.ubuntu.com
- advisory debian.org
- patch openwall.com