SILC Client Server Toolkit silc_pkcs1_decode() buffer overflow
| silc-silcpkcs1decode-bo (41474) |  High Risk |
Description:
SILC Client, SILC Server, and SILC Toolkit are vulnerable to a buffer overflow, caused by an integer overflow error in the silc_pkcs1_decode() function in silcpkcs1.c. By sending a specially-crafted PKCS#1 encoded packet, a remote attacker could overflow a buffer and exploit this vulnerability to corrupt memory and execute arbitrary code or cause a denial of service.
*CVSS:
| Base Score: | 7.5 |
| Access Vector: | Network |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 5.9 |
| Exploitability: | Proof-of-Concept |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
For SILC Server:
Upgrade to the latest version (1.1.2 or later), available from the SILC Web site. See References.
For SILC Client:
Upgrade to the latest version (1.1.4 or later), available from the SILC Web site. See References.
For SILC Toolkit:
Upgrade to the latest version (1.1.7 or later), available from the SILC Web site. See References.
References:
- CORE-2007-1212: SILC pkcs_decode buffer overflow .
- SILC Web site: SILC Toolkit 1.1.7 Released.
- SILC Web site: SILC Client 1.1.4 Released.
- SILC Web site: SILC Server 1.1.2 Released.
- BID-28373: SILC Client and Server Key Negotiation Protocol Remote Buffer Overflow Vulnerability
- CVE-2008-1552: The silc_pkcs1_decode function in the silccrypt library (silcpkcs1.c) in Secure Internet Live Conferencing (SILC) Toolkit before 1.1.7, SILC Client before 1.1.4, and SILC Server before 1.1.2 allows remote attackers to execute arbitrary code via a crafted PKCS#1 message, which triggers an integer underflow, signedness error, and a buffer overflow. NOTE: the researcher describes this as an integer overflow, but CVE uses the underflow term in cases of wraparound from unsigned subtraction.
- MDVSA-2008:158: silc-toolkit
- SA29463: SILC "silc_pkcs1_decode" Integer Overflow Vulnerability
- SECTRACK ID: 1019690: Secure Internet Live Conferencing (SILC) Buffer Overflow in Processing PKCS Data Lets Remote Users Execute Arbitrary Code
- SUSE-SR:2008:008: SUSE Security Summary Advisory
- VUPEN/ADV-2008-0974: SILC Products PKSC#1 Message Buffer Overflow Vulnerability
Platforms Affected:
- MandrakeSoft Mandrake Linux 2008.0 X86_64
- MandrakeSoft Mandrake Linux 2008.0
- Pekka Riikonen SILC Client 1.1.4
- Pekka Riikonen SILC Server 1.1.2
- Pekka Riikonen SILC Toolkit prior to 1.1.7
Reported:
Mar 25, 2008
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.