# CVE-2024-38440: netatalk: Netatalk before 3.2.1 has an off-by-one error, and resultant heap-based buffer overflow and segmentation violation, b...

CVE-2024-38440 is fixed in netatalk on 1 platform, first by netatalk 2.2.6-1ubuntu0.18.04.2+esm2, released June 16, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-38440
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0088
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 16, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | netatalk Debian 13.5 (trixie) | 3.1.18~ds-2 | [DEBIAN-CVE-2024-38440](https://patchblox.com/security/data/fix/linux/debian-cve-2024-38440.md) | Jun 16, 2024 |
| Linux | netatalk Debian 14 | 3.1.18~ds-2 | [DEBIAN-CVE-2024-38440](https://patchblox.com/security/data/fix/linux/debian-cve-2024-38440.md) | Jun 16, 2024 |
| Linux | netatalk Ubuntu 18.04.6 LTS (bionic) | 2.2.6-1ubuntu0.18.04.2+esm2 | [netatalk 2.2.6-1ubuntu0.18.04.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-netatalk-2.2.6-1ubuntu0.18.04.2-esm2.md) | Jun 16, 2024 |
| Linux | netatalk Ubuntu 20.04 LTS (focal) | 3.1.12~ds-4ubuntu0.20.04.4 | [netatalk 3.1.12~ds-4ubuntu0.20.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-netatalk-3.1.12-ds-4ubuntu0.20.04.4.md) | Jun 16, 2024 |
| Linux | netatalk Ubuntu 22.04.1 LTS (jammy) | 3.1.12~ds-9ubuntu0.22.04.4 | [netatalk 3.1.12~ds-9ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-netatalk-3.1.12-ds-9ubuntu0.22.04.4.md) | Jun 16, 2024 |
| Linux | netatalk Ubuntu 24.04.5 LTS (noble) | 3.1.18~ds-1ubuntu0.1~esm1 | [netatalk 3.1.18~ds-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-netatalk-3.1.18-ds-1ubuntu0.1-esm1.md) | Jun 16, 2024 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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