Illumos
CVE-2020-27678
CRITICAL
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. |
| Exploit ScenarioDerived | A remote attacker could overflow a buffer to corrupt adjacent memory by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
An issue was discovered in illumos before 2020-10-22, as used in OmniOS before r151030by, r151032ay, and r151034y and SmartOS before 20201022. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Buffer Copy without Size Check vulnerability could allow attackers to overflow a buffer to corrupt adjacent memory.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.
Affects your stack
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Technical ContextAI · show details
This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. An issue was discovered in illumos before 2020-10-22, as used in OmniOS before r151030by, r151032ay, and r151034y and SmartOS before 20201022. There is a buffer overflow in parse_user_name in lib/libpam/pam_framework.c. Affected products include: Illumos, Joyent Smartos, Omniosce Omnios. Version information: before 2020.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
An issue was discovered in illumos before 2020-10-22, as used in OmniOS before r151030by, r151032ay, and r151034y and SmartOS before 20201022. There is a buffer overflow in parse_user_name in lib/libpam/pam_framework.c.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Affected Products (CPE)NVD
The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix XenServer 6.0.2 and earlier and
illumos smbsrv NULL pointer dereference allows system crash. Rated high severity (CVSS 7.5), this vulnerability is remot
Remote kernel heap corruption in the illumos SCTP stack lets an unauthenticated attacker send a crafted INIT ACK packet
illumos osnet-incorporation bcopy() and bzero() implementations make signed instead of unsigned comparisons allowing a s
illumos illumos-gate before 676abcb has a stack buffer overflow in /dev/net, leading to privilege escalation via a stat
Kernel memory exhaustion in the illumos name service cache daemon (nscd) lets any local, unprivileged user - including o
Host denial-of-service in illumos bhyve allows a privileged guest user to panic the host by executing a REP-prefixed MOV
Kernel heap corruption in the illumos data-link pseudo-driver (dld) allows an unprivileged local user - including one co
Local denial of service in the illumos reparsed daemon (reparsed) lets a low-privileged authenticated local user crash t
NULL pointer dereference in the illumos Network Auto-Magic daemon (nwamd) allows any local user to crash the daemon - an
The devzvol_readdir function in illumos does not check the return value of a strchr call, which allows remote attackers
Local users holding an unprivileged account in any zone on an illumos-based host can send an unauthorized ZSD_CMD_NEW_ZO
Exploit-DB