Multiple vulnerabilities in Mercurial



Published: 2017-10-05 | Updated: 2020-07-23
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2017-1000115
CVE-2017-1000116
CWE-ID CWE-59
CWE-78
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Mercurial
Client/Desktop applications / Other client software

Vendor Mercurial

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Link following

EUVDB-ID: #VU31407

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-1000115

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Mercurial prior to version 4.3 is vulnerable to a missing symlink check that can malicious repositories to modify files outside the repository

Mitigation

Install update from vendor's website.

Vulnerable software versions

Mercurial: 4.0 - 4.2.3

External links

http://www.debian.org/security/2017/dsa-3963
http://www.securityfocus.com/bid/100290
http://access.redhat.com/errata/RHSA-2017:2489
http://security.gentoo.org/glsa/201709-18
http://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.3_.2F_4.3.1_.282017-08-10.29


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.

2) OS Command Injection

EUVDB-ID: #VU31408

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-1000116

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Mercurial prior to 4.3 did not adequately sanitize hostnames passed to ssh, leading to possible shell-injection attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Mercurial: 4.0 - 4.2.3

External links

http://www.debian.org/security/2017/dsa-3963
http://www.securityfocus.com/bid/100290
http://access.redhat.com/errata/RHSA-2017:2489
http://security.gentoo.org/glsa/201709-18
http://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.3_.2F_4.3.1_.282017-08-10.29


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.



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