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Thursday, 07 October 2021 07:10

Apache flaw being exploited in the wild, also allows RCE Featured

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Apache flaw being exploited in the wild, also allows RCE Image by WilliamsCreativity from Pixabay

Proof-of-concept exploit code has been released on the internet to take advantage of a directory path traversal flaw in version 2.4.49 of the well-known Apache Web server software.

Remote code execution can also be carried out by anyone who exploits the flaw.

Researcher Will Dorman, a vulnerability analyst at CERT/CC, said of the flaw: "...Apache needs to be the vulnerable 2.4.49 version, and mod-cgi is enabled, and it needs to be missing the default Require all denied. But if both of those are true, then CVE-2021-41773 is as RCE as it gets."

In its advisory, the Apache HTTP Server Project acknowledged that the vulnerability was being exploited in the wild. It credited Ash Daulton along with the cPanel Security Team for reporting the issue on 29 September.

The issue was fixed on 1 October and an update, 2.4.50. released on 4 October.

A second vulnerability, CVE-2021-41524, is also present in version 2.4.49 and allows an external source to stage a denial-of-service attack on a server.

Li Zhi Xin of NSFocus Security Team was credited for this bug which was reported on 17 September and patched through an update on 4 October.

Apache once had about 80% of the Web server software market, but in February this year, a survey by Netcraft found that its share had dropped to 26.3% of sites, 26.4% of domains and 32.7% of Web-facing computers.

nginx leads the Web server software market with 34.5% of sites, 30.4% of domains and 35% of Web-facing computers. But when it comes to the top million busiest sites, Apache has 25.5% of active sites, compared to 19.8% for nginx.


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Sam Varghese

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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