CVE-2019-15878 - Use After Free

Severity

78%

Complexity

18%

Confidentiality

98%

In FreeBSD 12.1-STABLE before r352509, 11.3-STABLE before r352509, and 11.3-RELEASE before p9, an unprivileged local user can trigger a use-after-free situation due to improper checking in SCTP when an application tries to update an SCTP-AUTH shared key.

CVSS 3.1 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 4.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

Type

FreeBSD

First reported 4 years ago

2020-05-13 16:15:00

Last updated 4 years ago

2020-05-18 05:15:00

Affected Software

FreeBSD FreeBSD 11.3

11.3

FreeBSD 11.3 Patch 1

11.3

FreeBSD 11.3 Patch 2

11.3

FreeBSD 11.3 Patch 3

11.3

FreeBSD FreeBSD 11.3 Patch 4

11.3

FreeBSD FreeBSD 11.3 Patch 5

11.3

FreeBSD 11.3 Patch 6

11.3

FreeBSD 11.3 Patch 7

11.3

FreeBSD 11.3 Patch 8

11.3

FreeBSD FreeBSD 12.1

12.1

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:14.sctp.asc

Vendor Advisory

https://security.netapp.com/advisory/ntap-20200518-0007/

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