CVE-2024-38440

2024-06-1600:00:00

mitre

github.com

netatalk

off-by-one error

heap-based buffer overflow

segmentation violation

fploginext

bn_bin2bn

uams_dhx_pam

AI Score

7.4

Confidence

High

SSVC

Exploitation

poc

Automatable

yes

Technical Impact

partial

JSON

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.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:netatalk:netatalk:*:*:*:*:*:*:*:*"
    ],
    "vendor": "netatalk",
    "product": "netatalk",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "3.2.1",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  }
]