VULNERABILITY

Amazon Linux AMI: CVE-2019-12521: Security patch for squid (ALAS-2020-1378)

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Amazon Linux AMI: CVE-2019-12521: Security patch for squid (ALAS-2020-1378)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:P)
Published
04/15/2020
Created
06/05/2020
Added
06/04/2020
Modified
08/25/2020

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)

  • amazon-linux-upgrade-squid

References

  • ALAS-2020-1378
  • USN-4356-1
  • CVE-2019-12521

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