Input validation error in cgit

1) Input validation error

EUVDB-ID: #VU45181

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-1027

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Off-by-one error in the convert_query_hexchar function in html.c in cgit.cgi in cgit before 0.8.3.5 allows remote attackers to cause a denial of service (infinite loop) via a string composed of a % (percent) character followed by invalid hex characters, as demonstrated by a %gg sequence.

Mitigation

Install update from vendor's website.

Vulnerable software versions

cgit: 0.1 - 0.8.3.3

CPE2.3

• cpe:2.3:a:jason_a_donenfeld:cgit:0.1:*:*:*:*:*:*:*
• cpe:2.3:a:jason_a_donenfeld:cgit:0.2:*:*:*:*:*:*:*
• cpe:2.3:a:jason_a_donenfeld:cgit:0.3:*:*:*:*:*:*:*

External links

https://article.gmane.org/gmane.comp.version-control.git/168493
https://hjemli.net/git/cgit/commit/?h=stable&id=fc384b16fb9787380746000d3cea2d53fccc548e
https://lists.fedoraproject.org/pipermail/package-announce/2011-March/055896.html
https://lists.fedoraproject.org/pipermail/package-announce/2011-March/055898.html
https://lists.fedoraproject.org/pipermail/package-announce/2011-March/055966.html
https://openwall.com/lists/oss-security/2011/03/07/3
https://secunia.com/advisories/43633
https://secunia.com/advisories/43788
https://www.osvdb.org/71005
https://www.securityfocus.com/bid/46756
https://www.vupen.com/english/advisories/2011/0667
https://bugzilla.redhat.com/show_bug.cgi?id=680905
https://exchange.xforce.ibmcloud.com/vulnerabilities/65919

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.