CVE-2019-5482

Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.

Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.

Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.

• CVE-2016-8618: fix double-free in curl_maprintf
• CVE-2016-8619: fix double-free in krb5 code
• CVE-2019-5482: fix heap buffer overflow in TFTP receive

libcurl contains a heap buffer overflow in the function (tftp_receive_packet()) that receives data from a TFTP server. It can call recvfrom() with the default size for the buffer rather than with the size that was used to allocate it. Thus, the content that might overwrite the heap memory is controlled by the server.

This flaw is only triggered if the TFTP server sends an OACK without the BLKSIZE option, when a BLKSIZE smaller than 512 bytes was requested by the TFTP client. OACK is a TFTP extension and is not used by all TFTP servers.

Users choosing a smaller block size than default should be rare as the primary use case for changing the size is to make it larger.

It is rare for users to use TFTP across the Internet. It is most commonly used within local networks. TFTP as a protocol is always inherently insecure.

This issue was introduced by the add of the TFTP BLKSIZE option handling. It was previously incompletely fixed by an almost identical issue called CVE-2019-5436.

The updated packages fix security vulnerabilities:

An integer overflow in curl's URL API results in a buffer overflow in libcurl 7.62.0 to and including 7.64.1. (CVE-2019-5435)

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1 (CVE-2019-5436).

Double-free vulnerability in the FTP-kerberos code in cURL 7.52.0 to 7.65.3 (CVE-2019-5481).

Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3 (CVE-2019-5482).

This update for curl fixes the following issues:

Security issues fixed:

• CVE-2019-5481: Fixed FTP-KRB double-free during kerberos FTP data transfer (bsc#1149495).
• CVE-2019-5482: Fixed TFTP small blocksize heap buffer overflow (bsc#1149496).

This update was imported from the SUSE:SLE-15:Update update project.

This update for curl fixes the following issues:

Security issues fixed:

• CVE-2019-5481: Fixed FTP-KRB double-free during kerberos FTP data transfer (bsc#1149495).
• CVE-2019-5482: Fixed TFTP small blocksize heap buffer overflow (bsc#1149496).

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the curl-7.79.1-1.1 package on the GA media of openSUSE Tumbleweed.

This update for curl fixes the following issues:

Security issue fixed:

• CVE-2019-5482: Fixed a TFTP small blocksize heap buffer overflow (bsc#1149496).

This update for curl fixes the following issues:

Security issue fixed:

• CVE-2019-5482: Fixed TFTP small blocksize heap buffer overflow (bsc#1149496).

This update for curl fixes the following issues:

Security issues fixed:

• CVE-2019-5481: Fixed FTP-KRB double-free during kerberos FTP data transfer (bsc#1149495).
• CVE-2019-5482: Fixed TFTP small blocksize heap buffer overflow (bsc#1149496).

This update for curl fixes the following issues:

Security issues fixed:

• CVE-2019-5481: Fixed a double-free during kerberos FTP data transfer. (bsc#1149495)
• CVE-2019-5482: Fixed a TFTP small block size heap buffer overflow (bsc#1149496).

Thomas Vegas discovered that curl incorrectly handled memory when using Kerberos over FTP. A remote attacker could use this issue to crash curl, resulting in a denial of service. (CVE-2019-5481)

Thomas Vegas discovered that curl incorrectly handled memory during TFTP transfers. A remote attacker could use this issue to crash curl, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2019-5482)

USN-4129-1 fixed a vulnerability in curl. This update provides the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.

Original advisory details:

Thomas Vegas discovered that curl incorrectly handled memory during TFTP transfers. A remote attacker could use this issue to crash curl, resulting in a denial of service, or possibly execute arbitrary code.