CVE-2019-12521
Published: 15 April 2020
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.
Priority
Medium
CVSS 3 base score: 5.9
Status
| Package | Release | Status |
|---|---|---|
|
squid Launchpad, Ubuntu, Debian |
Upstream |
Released
(4.11)
|
| Ubuntu 20.10 (Groovy Gorilla) |
Released
(4.10-1ubuntu2)
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Released
(4.10-1ubuntu1.1)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Does not exist
|
|
| Ubuntu 16.04 LTS (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
Patches: Upstream: http://www.squid-cache.org/Versions/v4/changesets/squid-4-fdd4123629320aa1ee4c3481bb392437c90d188d.patch |
||
|
squid3 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 20.10 (Groovy Gorilla) |
Does not exist
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Does not exist
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Released
(3.5.27-1ubuntu1.6)
|
|
| Ubuntu 16.04 LTS (Xenial Xerus) |
Released
(3.5.12-1ubuntu7.11)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|