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.

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.

Remote arbitrary code execution related to dsi_stream_receive(). (CVE-2021-31439) Remote arbitrary code execution related to parse_entries(). (CVE-2022-23121) Remote arbitrary code execution related to copyapplfile(). (CVE-2022-23125)

Heap overflow leading to arbitrary code execution. (CVE-2021-31439) Buffer overflow leading to remote code execution (CVE-2022-0194) Improper length validation leading to remote code execution (CVE-2022-23121) Buffer overflow leading to remote code execution (CVE-2022-23122) Out-of-bounds read leading to information disclosure (CVE-2022-23123) Out-of-bounds read leading to information disclosure (CVE-2022-23124) Improper length validation leading to remote code execution (CVE-2022-23125) Heap-based buffer overflow in afp_getappl resulting in code execution via a crafted .appl file (CVE-2022-45188)

This update for netatalk fixes the following issues:

• CVE-2022-23125: Fixed remote arbitrary code execution related to copyapplfile().
• CVE-2022-23121: Fixed remote arbitrary code execution related to parse_entries().
• CVE-2021-31439: Fixed remote arbitrary code execution related to dsi_stream_receive().

It was discovered that Netatalk did not properly validate the length of user-supplied data in the DSI structures. A remote attacker could possibly use this issue to execute arbitrary code with the privileges of the user invoking the programs. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2021-31439)

It was discovered that Netatalk did not properly validate the length of user-supplied data in the ad_addcomment function. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-0194)

It was discovered that Netatalk did not properly handle errors when parsing AppleDouble entries. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-23121)

It was discovered that Netatalk did not properly validate the length of user-supplied data in the setfilparams function. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-23122)

It was discovered that Netatalk did not properly validate the length of user-supplied data in the getdirparams function. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-23123)

It was discovered that Netatalk did not properly validate the length of user-supplied data in the get_finderinfo function. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-23124)

It was discovered that Netatalk did not properly validate the length of user-supplied data in the copyapplfile function. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-23125)

It was discovered that Netatalk did not properly validate the length of user-supplied data in the dsi_writeinit function. A remote attacker could possibly use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 22.10. (CVE-2022-43634)

It was discovered that Netatalk did not properly manage memory under certain circumstances. If a user were tricked into opening a specially crafted .appl file, a remote attacker could possibly use this issue to execute arbitrary code. (CVE-2022-45188)