• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

The FBI warns that Scattered Spider is now targeting the airline sector

 | 

LapDogs: China-nexus hackers Hijack 1,000+ SOHO devices for espionage

 | 

Taking over millions of developers exploiting an Open VSX Registry flaw

 | 

OneClik APT campaign targets energy sector with stealthy backdoors

 | 

APT42 impersonates cyber professionals to phish Israeli academics and journalists

 | 

Kai West, aka IntelBroker, indicted for cyberattacks causing $25M in damages

 | 

Cisco fixed critical ISE flaws allowing Root-level remote code execution

 | 

U.S. CISA adds AMI MegaRAC SPx, D-Link DIR-859 routers, and Fortinet FortiOS flaws to its Known Exploited Vulnerabilities catalog

 | 

CitrixBleed 2: The nightmare that echoes the 'CitrixBleed' flaw in Citrix NetScaler devices

 | 

Hackers deploy fake SonicWall VPN App to steal corporate credentials

 | 

Mainline Health Systems data breach impacted over 100,000 individuals

 | 

Disrupting the operations of cryptocurrency mining botnets

 | 

Prometei botnet activity has surged since March 2025

 | 

The U.S. House banned WhatsApp on government devices due to security concerns

 | 

Russia-linked APT28 use Signal chats to target Ukraine official with malware

 | 

China-linked APT Salt Typhoon targets Canadian Telecom companies

 | 

U.S. warns of incoming cyber threats following Iran airstrikes

 | 

McLaren Health Care data breach impacted over 743,000 people

 | 

American steel giant Nucor confirms data breach in May attack

 | 

The financial impact of Marks & Spencer and Co-op cyberattacks could reach £440M

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Hacking
  • libcurl has had authentication leak bug dated back to before September 1999

libcurl has had authentication leak bug dated back to before September 1999

Pierluigi Paganini January 25, 2018

According to a security advisory, libcurl is affected by a couple of issues, one of them might cause the leakage of authentication data to third parties.

libcurl is a free and easy-to-use client-side URL transfer library, it builds and works identically on numerous platforms.

According to a security advisory, libcurl is affected by a couple of issues, one of them might cause the leakage of authentication data to third parties.

The problem is related to the way it handles custom headers in HTTP requests.

“When asked to send custom headers in its HTTP requests, libcurl will send that set of headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the `Location:` response header value.” states the advisory.

“Sending the same set of headers to subsequest hosts is in particular a problem for applications that pass on custom `Authorization:` headers, as this header often contains privacy sensitive information or data that could allow others to impersonate the libcurl-using client’s request. We are not aware of any exploit of this flaw.”

Applications that pass on custom authorization headers could leak credentials or information that could be abused by attackers to impersonate the libcurl-using client’s request.

This vulnerability tracked as CVE-2018-1000007 has been present since before curl 6.0, back to before September 1999. Affected versions are libcurl 7.1 to and including 7.57.0, later versions (7.58.0) are not affected, the patch was published on GitHub.

“In libcurl version 7.58.0, custom `Authorization:` headers will be limited the same way other such headers is controlled within libcurl: they will only be sent to the host used in the original URL unless libcurl is told that it is ok to pass on to others using the `CURLOPT_UNRESTRICTED_AUTH` option.” states the advisory.

“this solution creates a slight change in behavior. Users who actually want to pass on the header to other hosts now need to give curl that specific permission. You do this with [–location-trusted](https://curl.haxx.se/docs/manpage.html#–location-trusted) with the curl command line tool.”

libcurl is also affected by an “HTTP/2 trailer out-of-bounds read” vulnerability tracked as CVE-2018-1000005.

The issue is related to the code that creates HTTP/1-like headers from the HTTP/2 trailer data that appends a string like `”:”` to the target buffer (it was recently changed to `”: “` (a space was added after the colon) but the associated math wasn’t updated correspondingly.

“When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to the libcurl callback. This might lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.” reads the advisory.

libcurl

The second issue, CVE-2018-1000005, is described as an “HTTP/2 trailer out-of-bounds read”. The advisory says “reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required.”

“When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to the libcurl callback. This might lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.”

Affected versions are libcurl 7.49.0 to and including 7.57.0, experts are not aware of any exploit of this vulnerability in the wild.

[adrotate banner=”9″] [adrotate banner=”12″]

Pierluigi Paganini

(Security Affairs – hacking)

[adrotate banner=”5″]

[adrotate banner=”13″]


facebook linkedin twitter

Hacking libcurl

you might also like

Pierluigi Paganini June 28, 2025
The FBI warns that Scattered Spider is now targeting the airline sector
Read more
Pierluigi Paganini June 28, 2025
LapDogs: China-nexus hackers Hijack 1,000+ SOHO devices for espionage
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    The FBI warns that Scattered Spider is now targeting the airline sector

    Cyber Crime / June 28, 2025

    LapDogs: China-nexus hackers Hijack 1,000+ SOHO devices for espionage

    Malware / June 28, 2025

    Taking over millions of developers exploiting an Open VSX Registry flaw

    Hacking / June 27, 2025

    OneClik APT campaign targets energy sector with stealthy backdoors

    Hacking / June 27, 2025

    APT42 impersonates cyber professionals to phish Israeli academics and journalists

    APT / June 27, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT