Denial of service vulnerabilities in Mercurial



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-13346
CVE-2018-13347
CVE-2018-13348
CWE-ID CWE-119
CWE-190
CWE-124
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Mercurial
Web applications / CRM systems

Vendor Mercurial

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU14211

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-2018-13346

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to boundary error when the mpatch_apply function in mpatch.c incorrectly proceeds in cases where the fragment start is past the end of the original data. 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

CPE2.3 External links

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


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) Integer overflow

EUVDB-ID: #VU14212

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-2018-13347

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow 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

CPE2.3 External links

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


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.

3) Buffer under-read

EUVDB-ID: #VU14213

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 - Buffer Underwrite ('Buffer Underflow')

Exploit availability: No

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

CPE2.3 External links

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


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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