Arbitrary Code Execution in Mercurial due to Malformed Repository
CVE-2017-17458

9.8CRITICAL

Key Information:

Vendor

Mercurial

Status
Mercurial
Vendor
CVE Published:
7 December 2017

What is CVE-2017-17458?

In earlier versions of Mercurial before 4.4.1, a vulnerability exists that can allow a specially crafted repository to execute arbitrary code. This occurs when Git subrepositories contain a malformed configuration that references a .git/hooks/post-update script. While typical usage of Mercurial limits the creation of such repositories, they can nonetheless be constructed programmatically by malicious actors, posing a significant risk if users unknowingly clone or operate in these environments. It is crucial for users to update to the latest version of Mercurial to mitigate this risk.

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References

https://lists.debian.org/debian-lts-announce/2017/12/msg0...
mailing-listx_refsource_MLIST
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.4...
x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2018/07/msg0...
mailing-listx_refsource_MLIST

EPSS Score

17% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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