7.5

CVE-2024-38440: netatalk Off-by-one Error

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2024-38440DEBIAN-CVE-2024-38440
Published 16-06-2024Last modified 03-11-2025
Open JSON

Vulnerability summary

CVE-2024-38440 is a high (CVSS 7.5) Off-by-one Error vulnerability in netatalk. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.88%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 4 · Related 2
DLA-3968-1MGASA-2024-0259SUSE-SU-2024:2301-1USN-7347-1

Timeline

  1. 16-06-2024
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

Description

Netatalk before 3.2.1 has an off-by-one error, and resultant heap-based buffer overflow and segmentation violation, because of incorrectly using FPLoginExt in BN_bin2bn in etc/uams/uams_dhx_pam.c. The original issue 1097 report stated: 'The latest version of Netatalk (v3.2.0) contains a security vulnerability. This vulnerability arises due to a lack of validation for the length field after parsing user-provided data, leading to an out-of-bounds heap write of one byte (\0). Under specific configurations, this can result in reading metadata of the next heap block, potentially causing a Denial of Service (DoS) under certain heap layouts or with ASAN enabled. ... The vulnerability is located in the FPLoginExt operation of Netatalk, in the BN_bin2bn function found in /etc/uams/uams_dhx_pam.c ... if (!(bn = BN_bin2bn((unsigned char *)ibuf, KEYSIZE, NULL))) ... threads ... [#0] Id 1, Name: "afpd", stopped 0x7ffff4304e58 in ?? (), reason: SIGSEGV ... [#0] 0x7ffff4304e58 mov BYTE PTR [r14+0x8], 0x0 ... mov rdx, QWORD PTR [rsp+0x18] ... afp_login_ext(obj=<optimized out>, ibuf=0x62d000010424 "", ibuflen=0xffffffffffff0015, rbuf=<optimized out>, rbuflen=<optimized out>) ... afp_over_dsi(obj=0x5555556154c0 <obj>).' 2.4.1 and 3.1.19 are also fixed versions.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.88%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

0.00 pp

From 0.88% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.88%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Netatalk

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • netatalk< 3.1.18~ds-2
Netatalk1 product
  • netatalk≥ 2.0.0, < 2.4.1 | ≥ 3.0, < 3.1.19 | 3.2.0
Ubuntu1 product
  • netatalk< 2.2.2-1ubuntu2.2+esm2 | < 2.2.5-1ubuntu0.2+esm2 | < 2.2.6-1ubuntu0.18.04.2+esm2 | < 3.1.12~ds-4ubuntu0.20.04.4 | < 3.1.12~ds-9ubuntu0.22.04.4 | < 3.1.18~ds-1ubuntu0.1~esm1

3 vendors · 3 products

References

10 links