Vulnerability Name:

CVE-2013-4434 (CCN-87849)

Assigned:2013-10-10
Published:2013-10-10
Updated:2018-10-30
Summary:Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.
CVSS v3 Severity:5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
3.7 Low (Temporal CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
3.7 Low (CCN Temporal CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-189
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2013-4434

Source: SUSE
Type: Third Party Advisory
openSUSE-SU-2013:1616

Source: SUSE
Type: Third Party Advisory
openSUSE-SU-2013:1696

Source: CCN
Type: oss-sec Mailing List, Thu, 10 Oct 2013 21:38:19 +0800
Re: CVE Request: dropbear sshd daemon 2013.59 release

Source: CCN
Type: SA55173
Dropbear SSH Server User Enumeration Weakness and Denial of Service Vulnerability

Source: SECUNIA
Type: Vendor Advisory
55173

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20131015 Re: CVE Request: dropbear sshd daemon 2013.59 release

Source: BID
Type: Third Party Advisory, VDB Entry
62993

Source: CCN
Type: BID-62993
Dropbear SSH 'svr-auth.c' User Enumeration Weakness

Source: XF
Type: UNKNOWN
dropbear-user-info-disc(87849)

Source: CCN
Type: Dropbear Web page
2013.59

Source: CONFIRM
Type: Vendor Advisory
https://matt.ucc.asn.au/dropbear/CHANGES

Source: CONFIRM
Type: Patch, Third Party Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a

Source: CONFIRM
Type: Third Party Advisory
https://support.citrix.com/article/CTX216642

Vulnerable Configuration:Configuration 1:
  • cpe:/a:dropbear_ssh_project:dropbear_ssh:*:*:*:*:*:*:*:* (Version < 2013.59)

    • Configuration CCN 1:
  • cpe:/a:dropbear_ssh_project:dropbear_ssh:2011.54:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:20134434
    V
    		CVE-2013-4434
    2017-03-01
    oval:com.ubuntu.precise:def:20134434000
    V
    		CVE-2013-4434 on Ubuntu 12.04 LTS (precise) - medium.
    2013-10-25
    oval:com.ubuntu.xenial:def:201344340000000
    V
    		CVE-2013-4434 on Ubuntu 16.04 LTS (xenial) - medium.
    2013-10-25
    oval:com.ubuntu.trusty:def:20134434000
    V
    		CVE-2013-4434 on Ubuntu 14.04 LTS (trusty) - medium.
    2013-10-25
    oval:com.ubuntu.xenial:def:20134434000
    V
    		CVE-2013-4434 on Ubuntu 16.04 LTS (xenial) - medium.
    2013-10-25
    BACK
    dropbear_ssh_project dropbear ssh *
    matt_johnston dropbear ssh server 2011.54