Vulnerability Details : CVE-2021-31439
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology DiskStation Manager. Authentication is not required to exploit this vulnerablity. The specific flaw exists within the processing of DSI structures in Netatalk. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-12326.
Vulnerability category: Execute code
Products affected by CVE-2021-31439
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:a:netatalk:netatalk:*:*:*:*:*:*:*:*
- cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31439
0.75%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31439
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:A/AC:L/Au:N/C:P/I:P/A:P |
6.5
|
6.4
|
NIST | |
|
8.8
|
HIGH | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
Zero Day Initiative | |
|
8.8
|
HIGH | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST |
CWE ids for CVE-2021-31439
-
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().Assigned by: zdi-disclosures@trendmicro.com (Secondary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-31439
-
https://www.zerodayinitiative.com/advisories/ZDI-21-492/
ZDI-21-492 | Zero Day InitiativeThird Party Advisory;VDB Entry
-
https://lists.debian.org/debian-lts-announce/2023/05/msg00018.html
[SECURITY] [DLA 3426-1] netatalk security updateMailing List;Third Party Advisory
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https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26
Synology 產品安全性諮詢 | Synology IncorporatedVendor Advisory
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https://security.gentoo.org/glsa/202311-02
Netatalk: Multiple Vulnerabilities including root remote code execution (GLSA 202311-02) — Gentoo securityIssue Tracking;Third Party Advisory
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https://www.debian.org/security/2023/dsa-5503
Debian -- Security Information -- DSA-5503-1 netatalkThird Party Advisory
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