CVE-2017-9078 - Double Free

Severity

93%

Complexity

86%

Confidentiality

165%

The server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a double free in cleanup of TCP listeners when the -a option is enabled.

The server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a double free in cleanup of TCP listeners when the -a option is enabled.

CVSS 3.0 Base Score 8.1. CVSS Attack Vector: network. CVSS Attack Complexity: high. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 9.3. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:C/I:C/A:C).

Demo Examples

Double Free

CWE-415

Double Free

CWE-415

While contrived, this code should be exploitable on Linux distributions which do not ship with heap-chunk check summing turned on.


               
}
free(buf1R2);

Overview

First reported 7 years ago

2017-05-19 14:29:00

Last updated 5 years ago

2019-10-04 09:15:00

Affected Software

Debian Linux 8.0 (Jessie)

8.0

References

http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2017q2/001985.html

Mailing List, Patch, Third Party Advisory

DSA-3859

Third Party Advisory

https://security.netapp.com/advisory/ntap-20191004-0006/

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