Netatalk Security Advisory
| Subject | Heap out-of-bounds write in uams_dhx_pam.c |
|---|---|
| CVE ID# | CVE-2024-38440 |
| Date | 2024/06/28 |
| Versions | 3.2.0, 3.0.0 - 3.1.18, 1.5.0 - 2.4.0 |
| Summary | Lack of user input validation can lead to an out-of-bounds heap write |
Description
The vulnerability originates in uams_dhx_pam.c and is caused by insufficient validation of the length field after parsing user input, leading to an out-of-bounds heap write of a single byte (\0)
In specific configurations, this can result in reading metadata from the next heap block, which may cause a Denial of Service (DoS) under certain heap layouts or when ASAN is enabled.
Patch Availability
Apply the patch with git hash 77b5d99 to hotfix your local Netatalk deployment.
Additionally, Netatalk 2.4.1, 3.1.19, and 3.2.1 have been released which include the security patch. Netatalk administrators are advised to upgrade to this version or apply the patch as soon as possible.
CVSS Calculation
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L (7.3)
Workaround
Build Netatalk without PAM support, or disable the uams_dhx.so authentication module in your afp.conf file.
Credits
Vulnerability found and reported by:
flysoar
Patch developed by:
Daniel Markstedt of the Netatalk team
References
Go back to the Security Policy.
