CVE-2018-16842

Curl versions 7.14.1 through 7.61.1 are vulnerable to a heap-based buffer over-read in the tool_msgs.c:voutf() function that may result in information exposure and denial of service.

Curl versions 7.14.1 through 7.61.1 are vulnerable to a heap-based buffer over-read in the tool_msgs.c:voutf() function that may result in information exposure and denial of service.

Curl versions 7.14.1 through 7.61.1 are vulnerable to a heap-based buffer over-read in the tool_msgs.c:voutf() function that may result in information exposure and denial of service.

curl contains a heap out of buffer read vulnerability.

The command line tool has a generic function for displaying warning and informational messages to stderr for various situations. For example if an unknown command line argument is used, or passed to it in a "config" file.

This display function formats the output to wrap at 80 columns. The wrap logic is however flawed, so if a single word in the message is itself longer than 80 bytes the buffer arithmetic calculates the remainder wrong and ends up reading behind the end of the buffer. This could lead to information disclosure or crash.

This vulnerability could lead to a security issue if used in this or similar situations:

1. a server somewhere uses the curl command line to run something
2. if it fails, it shows stderr to the user
3. the server takes user input for parts of its command line input
4. user provides something overly long that triggers this crash
5. the stderr output may now contain user memory contents that was not meant to be available

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:

• CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

This update for curl fixes the following issues:

• CVE-2018-16840: A use after free in closing SASL handles was fixed (bsc#1112758)
• CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

This update for curl fixes the following issues:

• CVE-2018-16839: A SASL password overflow via integer overflow was fixed which could lead to crashes (bsc#1112758)
• CVE-2018-16840: A use-after-free in SASL handle close was fixed which could lead to crashes (bsc#1112758)
• CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

This update for curl fixes the following issues:

• CVE-2018-16840: A use-after-free in SASL handle close was fixed (bsc#1112758)
• CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

This update for curl fixes the following issues:

Security issues fixed:

• CVE-2019-3822: Fixed a NTLMv2 type-3 header stack buffer overflow (bsc#1123377).
• CVE-2019-3823: Fixed an out-of-bounds read in the SMTP end-of-response (bsc#1123378).
• CVE-2018-16890: Fixed an out-of-bounds buffer read in NTLM type2 (bsc#1123371).
• CVE-2018-16842: Fixed an out-of-bounds read in tool_msgs.c (bsc#1113660).
• CVE-2018-16840: Fixed a use-after-free in handle close (bsc#1113029).
• CVE-2018-16839: Fixed an SASL password overflow caused by an integer overflow (bsc#1112758).

Harry Sintonen discovered that curl incorrectly handled SASL authentication. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-16839)

Brian Carpenter discovered that curl incorrectly handled memory when closing certain handles. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-16840)

Brian Carpenter discovered that the curl command-line tool incorrectly handled error messages. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2018-16842)