Vulnerability Name:

CVE-2020-10595 (CCN-178912)

Assigned:2020-03-30
Published:2020-03-30
Updated:2020-04-04
Summary:pam-krb5 before 4.9 has a buffer overflow that might cause remote code execution in situations involving supplemental prompting by a Kerberos library. It may overflow a buffer provided by the underlying Kerberos library by a single '\0' byte if an attacker responds to a prompt with an answer of a carefully chosen length. The effect may range from heap corruption to stack corruption depending on the structure of the underlying Kerberos library, with unknown effects but possibly including code execution. This code path is not used for normal authentication, but only when the Kerberos library does supplemental prompting, such as with PKINIT or when using the non-standard no_prompt PAM configuration option.
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)
8.5 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:C)
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
9.8 Critical (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (CCN 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:C)
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
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
10.0 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-120
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2020-10595

Source: CONFIRM
Type: Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/03/31/1

Source: XF
Type: UNKNOWN
pamkrb5-cve202010595-bo(178912)

Source: CCN
Type: pam-krb5 GIT Repository
Add CVE for buffer overflow security fix

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/rra/pam-krb5/commit/e7879e27a37119fad4faf133a9f70bdcdc75d760

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20200401 [SECURITY] [DLA 2166-1] libpam-krb5 security update

Source: CCN
Type: oss-sec Mailing List, Mon, 30 Mar 2020 20:21:18 -0700
pam-krb5 security advisory (4.9 and earlier)

Source: UBUNTU
Type: UNKNOWN
USN-4314-1

Source: DEBIAN
Type: Third Party Advisory
DSA-4648

Source: MISC
Type: UNKNOWN
https://www.eyrie.org/~eagle/software/pam-krb5/security/2020-03-30.html

Vulnerable Configuration:Configuration 1:
  • cpe:/a:pam-krb5_project:pam-krb5:*:*:*:*:*:*:*:* (Version < 4.9)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    pam-krb5_project pam-krb5 *
    debian debian linux 8.0
    debian debian linux 9.0
    debian debian linux 10.0