Vulnerability Name:

CVE-2018-19826 (CCN-153717)

Assigned:2018-12-02
Published:2018-12-02
Updated:2019-10-03
Summary:** DISPUTED ** In inspect.cpp in LibSass 3.5.5, a high memory footprint caused by an endless loop (containing a Sass::Inspect::operator()(Sass::String_Quoted*) stack frame) may cause a Denial of Service via crafted sass input files with stray '&' or '/' characters.
Note: Upstream comments indicate this issue is closed as "won't fix" and "works as intended" by design.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
3.3 Low (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
2.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:U/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): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
1.7 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-835
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2018-19826

Source: XF
Type: UNKNOWN
libsass-cve201819826-dos(153717)

Source: CCN
Type: libsass GIT Repository
Out of Memory (crash) with malformed input files (Adding an extra '/' or '&') #2781

Source: MISC
Type: Third Party Advisory
https://github.com/sass/libsass/issues/2781

Vulnerable Configuration:Configuration 1:
  • cpe:/a:sass-lang:libsass:3.5.5:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.bionic:def:201819826000
    V
    		CVE-2018-19826 on Ubuntu 18.04 LTS (bionic) - medium.
    2018-12-03
    oval:com.ubuntu.bionic:def:2018198260000000
    V
    		CVE-2018-19826 on Ubuntu 18.04 LTS (bionic) - medium.
    2018-12-03
    oval:com.ubuntu.cosmic:def:201819826000
    V
    		CVE-2018-19826 on Ubuntu 18.10 (cosmic) - medium.
    2018-12-03
    oval:com.ubuntu.xenial:def:2018198260000000
    V
    		CVE-2018-19826 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-12-03
    oval:com.ubuntu.xenial:def:201819826000
    V
    		CVE-2018-19826 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-12-03
    oval:com.ubuntu.disco:def:2018198260000000
    V
    		CVE-2018-19826 on Ubuntu 19.04 (disco) - medium.
    2018-12-03
    oval:com.ubuntu.cosmic:def:2018198260000000
    V
    		CVE-2018-19826 on Ubuntu 18.10 (cosmic) - medium.
    2018-12-03
    BACK
    sass-lang libsass 3.5.5