Vulnerability Name:

CVE-2019-19334 (CCN-172737)

Assigned:2019-12-04
Published:2019-12-04
Updated:2019-12-18
Summary:In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.2 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:R)
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): High
Integrity (I): High
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
4.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): Low
8.1 High (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
4.3 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
Vulnerability Type:CWE-787
CWE-121
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2019-19334

Source: REDHAT
Type: UNKNOWN
RHSA-2019:4360

Source: CCN
Type: Red Hat Bugzilla – Bug 1779576
(CVE-2019-19334) - CVE-2019-19334 libyang: stack-based buffer overflow in make_canonical when identityref leaf type is used

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334

Source: XF
Type: UNKNOWN
libyang-cve201919334-bo(172737)

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6

Source: CCN
Type: libyang GIT Repository
Releases · CESNET/libyang · GitHub

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2019-dfe0b42bc5

Source: FEDORA
Type: UNKNOWN
FEDORA-2019-9d83929ffa

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-19334

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cesnet:libyang:0.11:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.11:r2:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.12:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.12:r2:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.13:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.13:r2:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.14:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.15:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.16:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.16:r2:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:0.16:r3:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:1.0:r1:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:1.0:r2:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:1.0:r3:*:*:*:*:*:*
  • OR cpe:/a:cesnet:libyang:1.0:r4:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:fedoraproject:fedora:31:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.redhat.rhsa:def:20194360
    P
    		RHSA-2019:4360: libyang security update (Important)
    2019-12-23
    oval:com.ubuntu.disco:def:2019193340000000
    V
    		CVE-2019-19334 on Ubuntu 19.04 (disco) - medium.
    2019-12-06
    BACK
    cesnet libyang 0.11 r1
    cesnet libyang 0.11 r2
    cesnet libyang 0.12 r1
    cesnet libyang 0.12 r2
    cesnet libyang 0.13 r1
    cesnet libyang 0.13 r2
    cesnet libyang 0.14 r1
    cesnet libyang 0.15 r1
    cesnet libyang 0.16 r1
    cesnet libyang 0.16 r2
    cesnet libyang 0.16 r3
    cesnet libyang 1.0 r1
    cesnet libyang 1.0 r2
    cesnet libyang 1.0 r3
    cesnet libyang 1.0 r4
    redhat enterprise linux 8.0
    fedoraproject fedora 31