CVE-2020-8445
Because newlines (\n) are permitted in messages processed by ossec-analysisd, it may be possible to inject nested events into the ossec log.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In OSSEC-HIDS 2.7 through 3.5.0, the OS_CleanMSG function in ossec-analysisd doesn't remove or encode terminal control characters or newlines from processed log messages. In many cases, those characters are later logged. Because newlines (\n) are permitted in messages processed by ossec-analysisd, it may be possible to inject nested events into the ossec log. Use of terminal control characters may allow obfuscating events or executing commands when viewed through vulnerable terminal emulators. This may be an unauthenticated remote attack for certain types and origins of logged data.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.28% probability · 82th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- ossec/ossec
- Source
- cve@mitre.org
References
- https://github.com/ossec/ossec-hids/issues/1814Third Party Advisory
- https://github.com/ossec/ossec-hids/issues/1821Third Party Advisory
- https://security.gentoo.org/glsa/202007-33Third Party Advisory
- https://www.ossec.net/Vendor Advisory
- https://github.com/ossec/ossec-hids/issues/1814Third Party Advisory
- https://github.com/ossec/ossec-hids/issues/1821Third Party Advisory
- https://security.gentoo.org/glsa/202007-33Third Party Advisory
- https://www.ossec.net/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.