CVE-2020-8177

curl 7.20.0 through 7.70.0 is vulnerable to improper restriction of names for files and other resources that can lead too overwriting a local file when the -J flag is used.

curl 7.20.0 through 7.70.0 is vulnerable to improper restriction of names for files and other resources that can lead too overwriting a local file when the -J flag is used.

curl 7.20.0 through 7.70.0 is vulnerable to improper restriction of names for files and other resources that can lead too overwriting a local file when the -J flag is used.

curl 7.20.0 through 7.70.0 is vulnerable to improper restriction of names for files and other resources that can lead too overwriting a local file when the -J flag is used.

curl can be tricked by a malicious server to overwrite a local file when using -J (--remote-header-name) and -i (--include) in the same command line.

The command line tool offers the -J option that saves a remote file using the filename present in the Content-Disposition: response header. curl then refuses to overwrite an existing local file using the same name, if one already exists in the current directory.

The -J flag is designed to save a response body, and so it does not work together with -i and there is logic that forbids it. However, the check is flawed and does not properly check for when the options are used in the reversed order: first using -J and then -i were mistakenly accepted.

The result of this mistake was that incoming HTTP headers could overwrite a local file if one existed, as the check to avoid the local file was done first when body data was received, and due to the mistake mentioned above, it could already have received and saved headers by that time.

The saved file would only get response headers added to it, as it would abort the saving when the first body byte arrives. A malicious server could however still be made to send back virtually anything as headers and curl would save them like this, until the first CRLF-CRLF sequence appears.

(Also note that -J needs to be used in combination with -O to have any effect.)

Updated curl packages fix security vulnerabilities:

libcurl can be tricked to prepend a part of the password to the host name before it resolves it, potentially leaking the partial password over the network and to the DNS server(s) (CVE-2020-8169).

curl can be tricked by a malicious server to overwrite a local file when using -J (--remote-header-name) and -i (--include) in the same command line (CVE-2020-8177).

The curl package has been updated to version 7.71.0, fixing these issues and other bugs.

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).
• CVE-2020-8169: Fixed an issue where could have led to partial password leak
  over DNS on HTTP redirect (bsc#1173026).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).

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

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).
• CVE-2020-8169: Fixed an issue where could have led to partial password leak
  over DNS on HTTP redirect (bsc#1173026).

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).

This update for curl fixes the following issues:

• CVE-2020-8177: Fixed an issue where curl could have been tricked by a malicious server to overwrite a local file when using the -J option (bsc#1173027).

Marek Szlagor, Gregory Jefferis and Jeroen Ooms discovered that curl incorrectly handled certain credentials. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 19.10 and Ubuntu 20.04 LTS. (CVE-2020-8169)

It was discovered that curl incorrectly handled certain parameters. An attacker could possibly use this issue to overwrite a local file. (CVE-2020-8177)