#VU14213 Buffer under-read in Mercurial - CVE-2018-13348

Vulnerability identifier: #VU14213

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-13348

CWE-ID: CWE-124

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mercurial
Client/Desktop applications / Other client software

Vendor: Mercurial

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to buffer under-read when the mpatch_decode function in mpatch.c mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not. A remote unauthenticated attacker can supply specially crafted input, trigger memory corruption and cause the service to crash.

Mitigation
Update to version 4.6.1.

Vulnerable software versions

Mercurial: 4.0.0 - 4.6.0

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External links
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.6.1_.282018-06-06.29

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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.